Oldsmobile V8 engine#303

The first Oldsmobile V8 was of a flathead design that was developed by Northway Engine Works before GM assumed operations. It was installed in the Oldsmobile Light Eight and was related to the Cadillac flathead V8 engine.{{cite web |title=Northway Engine Works |url=https://forums.aaca.org/topic/33254-northway-engine-works/ |website=Antique Automobile Club |date=6 November 2002 |publisher=Antique Automobile Club of America. |access-date=6 April 2021}}{{cite web |title=Oldsmobile Light Eight brochure |url=https://www.xr793.com/wp-content/uploads/2017/02/1923-Oldsmobile-47-Light-Eight.pdf |access-date=12 December 2020}} In 1929, Oldsmobile installed a 90 degree monobloc flathead V8 engine in the Viking companion brand before the monobloc was used in LaSalle and Cadillac vehicles from 1929-1931.

{{Infobox engine

|name=First generation

|production=1949–1964

|displacement={{cvt|303|cuin|L|1}}
{{cvt|324|cuin|L|1}}
{{cvt|371|cuin|L|1}}
{{cvt|394|cuin|L|1}}

|bore={{cvt|3.750|in|mm|1}}
{{cvt|3.875|in|mm|1}}
{{cvt|4.000|in|mm|1}}
{{cvt|4.125|in|mm|1}}

|stroke={{cvt|3.4375|in|mm|1}}
{{cvt|3.6875|in|mm|1}}

}}

The first generation of Oldsmobile V8s were tall deck big blocks available from 1949-1964. Each engine in this generation is quite similar with the same size block and heads.

File:Oldsmobile Rocket V-8 303 c.i (5L) on display.jpg

The {{convert|303|CID|L|1|adj=on}} engine had hydraulic lifters, an oversquare bore:stroke ratio, a counterweighted forged crankshaft, aluminum pistons, floating wristpins, and a dual-plane intake manifold. The 303 was produced from 1949-1953. Bore was {{cvt|3.75|in|mm}} and stroke was {{cvt|3.4375|in|mm}}. Cadillac used a distantly related engine which appeared in three different sizes through to the 1962 model year; though the Oldsmobile and Cadillac motors were not physically related, many lessons learned by one division were incorporated into the other's design, and the result were two engines known for their excellent power-to-weight ratio, fuel economy, and smooth, strong, reliable running.

The original Oldsmobile V8 was to have been marketed as "Kettering Power" after chief engineer Charles Kettering, but company policy prohibited the use of his name. Instead, influenced by the Space Race between the United States and the USSR, the legendary Rocket was born, available in Oldsmobile's 88, Super 88, and 98 models. The engine proved so popular, the division's 88 models were popularly called Rocket 88s.

From 1949 until 1951, the 2-barrel carburetor 303 produced {{cvt|135|hp|kW}} and {{cvt|253|lbft|N.m}}. Its output of 0.45 hp per cubic inch was 7% better than the 0.42 hp per cubic inch of the popular and widely produced {{cvt|100|hp|kW}} 1949 Ford Flathead V8. 1952 88 and Super 88 V8s used a 4-barrel carburetor for {{cvt|160|hp|kW}} and {{cvt|265|lbft|N.m}}, while 4-barrel 1953 versions raised compression from 7.5:1 to 8.0:1 for {{cvt|165|hp|kW}} and {{cvt|275|lbft|N.m}}.

Applications:

• 1949–1953 Oldsmobile 88
• 1949–1953 Oldsmobile 98
• 1952–1953 Oldsmobile Super 88

File:324ci Oldsmobile Rocket V8 engine, 1954-56.jpg

The {{cvt|324|CID|L|1}} version was produced from 1954 until 1956. Bore was increased to {{cvt|3.875|in|mm}} (same as the later 283 Chevy) and stroke remained the same at {{cvt|3.4375|in|mm}}. Two-barrel carburetion was standard; all high performance 324s came with four-barrel carburetors. The 324 was shared with GMC trucks.

The 1954 88 and Super 88 V8s used an 8.25:1 compression ratio for {{cvt|170|and|185|hp|kW|0}} and {{cvt|295|and|300|lbft|Nm|0}}, respectively.

The 1955 model upped the compression to 8.5:1 for {{cvt|185|hp|kW}} and {{cvt|320|lbft|N.m}} in the 88 and {{cvt|202|hp|kW}} and {{cvt|332|lbft|N.m}} in the Super 88 and 98. For engines built during the first part of 1955, the 324 skirted pistons had a reputation for failing due to the cast aluminum skirt separating from its steel interior brace. This problem did not appear until the engine had over {{convert|50000|mi|km}} on it. By late 1956, many Olds dealers learned about the problem. Compression was up again in 1956 for {{cvt|230|hp|kW}} and {{cvt|340|lbft|N.m}} in the 88 and {{cvt|240|hp|kW}} and {{cvt|350|lbft|N.m}} in the Super 88 and 98.

Applications:

• 1954–1956 Oldsmobile 88
• 1954–1956 Oldsmobile Super 88
• 1954–1956 Oldsmobile 98

File:18Aaan17 - Oldsmobile.jpg

The 371 made its debut in 1957 as standard equipment on all Olds models,Flory, J. "Kelly", Jr. American Cars 1946-1959 (Jefferson, NC: McFarland & Coy, 2008), p.833. and was produced through 1960. Bore was up to {{cvt|4.0|in|mm}} and stroke was increased to {{cvt|3.6875|in|mm}} for {{cvt|371|CID|L|1}}. 1959 and 1960 371s used green painted valve covers. 4-barrel models used 9.25:1 compression in 1957 and 10:1 in 1958 for {{cvt|277|hp|kW}} and {{cvt|400|lbft|N.m}} and {{cvt|305|hp|kW}} and {{cvt|410|lbft|N.m}} respectively. A 1958 2-barrel version produced {{cvt|265|hp|kW}} and {{cvt|390|lbft|N.m}}, but had problems with early camshaft failures due to the high preload valve spring forces. Following the Automobile Manufacturer Association ban on factory supported racing, power ratings went down for the 1959 and 1960 88 models: {{cvt|270|hp|kW}} and {{cvt|390|lbft|N.m}} for 1959 and {{cvt|240|hp|kW}} and {{cvt|375|lbft|N.m}} for 1960. It was no longer available in cars in 1961.Flory, J. "Kelly", Jr. American Cars 1960-1972 (Jefferson, NC: McFarland & Coy, 2004), p.118.

This engine was used in GMC heavy trucks as the "370" of 232 gross HP at 4200 rpm and torque 355 gross lbs-ft at 2600 rpm from 1957 to 1959. It had hardened valve seats and other features for heavy duty usage.{{citation needed|date=October 2017}}

Applications:

• 1957–1960 Oldsmobile 88
• 1957–1958 Oldsmobile Super 88
• 1957–1958 Oldsmobile 98

Introduced in the middle of the 1957 model year,Flory, American Cars 1946-1959 p.833. the 1957 and 1958 J-2 Golden Rocket had three two-barrel (twin choke) carburetors with a vacuum-operated linkage. Only the center carburetor was mechanically connected to the throttle pedal, and it was the only one equipped with a choke. When the center carburetor was opened to 60° or more engine vacuum drawn from the windshield wiper pump would simultaneously open the front and rear carburetors. These carburetors did not open progressively; they were either open or closed. The J-2 engine also had a slightly thinner head gasket, raising compression to 10.0:1. It was advertised with gross power and torque ratings of {{cvt|312|hp|kW}} at 4600 rpm and {{cvt|415|lbft|N.m}} at 2800 rpm. Oldsmobile charged $83 for the J-2 option with the three-speed manual (or in the 98),Flory, American Cars 1946-1959, p.834. $314 with the automatic.The optional heater-defroster cost $85 that year, the optional base radio $96. Flory, American Cars 1946-1959, p.834.

In practice, owners who did not regularly drive hard enough to engage the front and rear carburetors experienced problems with the linkage and carburetor throats becoming clogged, and some J-2-equipped cars had the front and rear carburetors removed and blocked off. Moreover, correct tuning was a continual headache. The package was expensive to produce, and Oldsmobile discontinued it after 1958.

Bore was up to {{cvt|4.125|in|mm}} for the largest first-generation Rocket, the {{cvt|394|CID|L|1}}. 394s were produced from 1959–1964 and were available on many Olds models. Most 394s used 2-barrel carburetors, but special high-compression 4-barrel versions were available starting in 1961.

Power for the base engine was up to 315 hp (235 kW), even though compression was down a quarter point, to 9.75:1.Flory, American Cars 1946-1959, p.990.

The 394 replaced the 371 in Super 88 and 98 cars for 1959 and 1960 and a detuned version was used in the 88 for 1961 and the Dynamic 88 for 1962-1964.

Applications:

• 1959–1960 Oldsmobile Super 88, {{cvt|315|hp|kW}} and {{cvt|435|lbft|N.m}}
• 1959–1960 Oldsmobile 98, {{cvt|315|hp|kW}} and {{cvt|435|lbft|N.m}}
• 1961 Oldsmobile 88, {{cvt|250|hp|kW}} and {{cvt|405|lbft|N.m}}
• 1962–1964 Oldsmobile Dynamic 88, {{cvt|280|hp|kW}} and {{cvt|430|lbft|N.m}}
• 1964 Oldsmobile Jetstar I, {{cvt|345|hp|kW}} and {{cvt|440|lbft|N.m}}

The 1961 through 1963 Sky Rocket (and 1964 Rocket) was a high-compression, four-barrel {{cvt|394|CID|L|1}} engine. The 10:1 compression 1961 model produced {{cvt|325|hp|kW}} and {{cvt|435|lbft|N.m}}, while the 10.25:1 1962-1964 version upped power to {{cvt|330|hp|kW}} and {{cvt|440|lbft|N.m}}. A special 1963 10.5:1 version was also produced with {{cvt|345|hp|kW}}.

Applications:

• 1961–1963 Oldsmobile Dynamic 88 (option)
• 1961–1964 Oldsmobile Super 88 (standard)
• 1961–1964 Oldsmobile 98 (standard)

The high-compression four-barrel 394 cu. in. 1964 Starfire produced {{cvt|345|hp|kW}} and {{cvt|440|lbft|N.m}} for the 1963-4 Starfire and 98 Custom-Sports Coupe. It was optional on 1964 98s and Super 88s.

From 1961-1963, Oldsmobile manufactured its own version of the Buick-designed, all-aluminum 215 cubic inch (3.5L) V8 engine for the F-85 compact. Known variously as the Rockette, Cutlass, and Turbo-Rocket by Oldsmobile (and as Fireball and Skylark by Buick),Depending on carburetion or use of turbocharger. Flory, J. "Kelly", Jr. American Cars 1960-1972 (Jefferson, NC: McFarland & Coy, 2004), pp.205 & 246. it was a compact, lightweight engine measuring {{cvt|28|in|cm}} long, {{cvt|26|in|cm}} wide, and {{cvt|27|in|cm}} high, with a dry weight of only {{cvt|320|lb|kg}}.Baechtel, p.67. The Oldsmobile engine was very similar to the Buick engine, but not identical: it had larger wedge combustion chambers with flat-topped (rather than domed) pistons, six bolts rather than five per cylinder head, and slightly larger intake valves; the valves were actuated by shaft-mounted rocker arms like the Buick and Pontiac versions, but the shafts and rockers were unique to Oldsmobile. With an 8.75:1 compression ratio and a 2-barrel carburetor, the Olds 215 had the same rated hp, {{cvt|155|hp|kW}} at 4800 rpm, as the Buick 215, with {{cvt|220|ft.lbf|N.m}} of torque at 2400 rpm. With a 4-barrel carburetor and 10.25:1 compression, the Olds 215 made {{cvt|185|hp|kW}} at 4800 rpm and {{cvt|230|lbft|N.m}} at 3200 rpm with a manual transmission. With a 4-barrel carburetor and 10.75:1 compression, the Olds 215 made {{cvt|195|hp|kW}} at 4800 rpm and {{cvt|235|lbft|N.m}} at 3200 rpm with an automatic. The Buick version was rated at 200 hp with an 11:1 compression ratio. The Oldsmobile Turbo-Rocket had 10.25:1 compression and was rated at {{cvt|215|hp|kW}}.

The Buick version of the 215 V8 went on to become the well known Rover V8, which still remains in limited production,{{where|date=May 2024}}{{when|date=May 2024}} utilizing the Buick-style pistons, heads, and valve train gear.

The Oldsmobile engine block formed the basis of the Repco 3-liter engine used by Brabham to win the 1966 and 1967 Formula One world championships. The early Repco engines produced up to {{cvt|300|bhp}}, and featured new SOHC cylinder heads and iron cylinder liners. The 1967 and later versions of the Repco engine had proprietary engine blocks.

In the mid-1980s, hot rodders discovered the 215 could be stretched to as much as {{cvt|305|cid|L|0}}, using the Buick 300 crankshaft, new cylinder sleeves, and an assortment of non-GM parts.Davis, Marlan. "Affordable Aluminum V8's [sic]", in Hot Rod Magazine, March 1985, pp.84-9 & 121. It could also be fitted with high-compression cylinder heads from the Morgan +8.

==={{anchor|Turbo Jetfire}}Turbo-Rocket===

File:1962 Oldsmobile Jetfire (27224201910).jpg

In 1962 and 1963 Oldsmobile built a turbocharged version of the 215, designated Turbo-Rocket. The turbocharger fitted to the V8 engine was a small-diameter Garrett T5 model with integral wastegate, manufactured by Garrett AiResearch, and produced a maximum of 5 psi (34 kPa) boost at 2200 rpm. The engine had 10.25:1 compression and a single-barrel carburetor. It was rated at {{cvt|215|hp|kW}} at 4600 rpm and {{cvt|300|lbft|N.m}} at 3200 rpm. In development, the high compression ratio combined with the charged load created problems with spark knock on hard throttle applications, which led Olds to develop and utilize a novel water-injection system that sprayed metered amounts of distilled water and methyl alcohol (dubbed "Turbo-Rocket Fluid") into the intake manifold air-stream to cool the intake charge. If the fluid reservoir was empty, a complex double-float and valve assembly in the Turbo-Rocket Fluid path would set a second butterfly (positioned between the throttle butterfly and the turbocharger) into the closed position, limiting the amount of boost pressure. Many customers did not keep the reservoir filled, or had mechanical problems with the turbocharger system which resulted in many of the turbo-charger installations being removed and a conventional 4-barrel carburetor and manifold installed in its place.

The Turbo-Rocket V8 was offered exclusively on the Oldsmobile Jetfire, a special version of the Cutlass compact hardtop coupe, which is noteworthy as it is one of the world's first (in fact the second) turbocharged passenger car ever offered for public sale. The Chevrolet Corvair Spyder Turbo, likewise a forced induction i.e turbo-powered car, predated the Oldsmobile Jetfire Turbo, however by only a few weeks,{{citation needed|date=July 2016}} thus being the world's very first turbocharged commercially sold vehicle.{{contradictory inline|article=Chevrolet Corvair#First generation (1960–1964)|reason=The Chevy Corvair article says that it came second while this article says it was the first.|date=November 2023}}

{{clear}}

{{Infobox engine

|name=Second generation

|production=1964–1990

|displacement={{ubl

| Small-block:

| {{cvt|4269|cc|cuin|1|disp=flip}}

| {{cvt|5033|cc|cuin|1|disp=flip}}

| {{cvt|5404|cc|cuin|1|disp=flip}}

| {{cvt|5737|cc|cuin|1|disp=flip}}

| {{cvt|6598|cc|cuin|1|disp=flip}}

| Big-block:

| {{cvt|6549|cc|CID|1|disp=flip}}

| {{cvt|6554|cc|CID|1|disp=flip}}

| {{cvt|6967|cc|CID|1|disp=flip}}

| {{cvt|7450|cc|CID|1|disp=flip}}

}}

|bore=Small-block:
{{cvt|3.500|in|mm|1}}
{{cvt|3.800|in|mm|1}}
{{cvt|3.9375|in|mm|1}}
{{cvt|4.057|in|mm|1}}
{{cvt|4.351|in|mm|1}}
Big-block:
{{cvt|3.870|in|mm|1}}
{{cvt|4.000|in|mm|1}}
{{cvt|4.126|in|mm|1}}

|stroke=Small-block:
{{cvt|3.385|in|mm|1}}
Big-block:
{{cvt|3.975|in|mm|1}}
{{cvt|4.250|in|mm|1}}

}}

The second generation of Oldsmobile V8s was produced from 1964-1990. Most of these engines were very similar, using the same bore centers and a {{cvt|9.33|in|mm}} deck height, raised on "big-block" versions to {{cvt|10.625|in|mm}}. Big-block and Diesel versions also increased the {{cvt|2.5|in|mm}} main bearing journal to {{cvt|3.0|in|mm}} for increased strength. All generation-2 small-block Olds V8s used the same stroke of {{cvt|3.385|in|mm|0}}. The big-block engines initially used a forged crankshaft with a stroke of 3.975" for the 1965-1967 425 and 400 CID versions; starting in 1968, both the {{cvt|400|CID|L|1}} and the {{cvt|455|CID|L|1}} big blocks used a stroke of {{cvt|4.25|in|mm}}, with crankshaft material changed to cast iron except in a few rare cases.

These were wedge-head engines with a unique combustion chamber that resulted from a valve angle of only 6°. This was much flatter than the 23° of the small-block Chevrolet and 20° of the Ford small-block wedge heads. This very open and flat chamber was fuel efficient and had lower than average emissions output. It was the only GM engine to meet US emission standards using a carburetor all the way up to 1990.

The first second-generation Oldsmobile V8 {{cvt|330|CID|L|1}} "Jetfire Rocket" introduced in 1964 and produced through 1967. It was released one year earlier than the tall deck 425, and debuted the standard {{cvt|3.385|in|mm}} stroke; bore was {{cvt|3.938|in|mm}}. 330s were painted gold and had forged steel crankshafts. The 4-barrel versions had a larger diameter harmonic damper, the 2 barrel only a balancer hub without the rubberized outer ring.

The {{cvt|400|CID|L|1}} version was the second, tall-deck "big-block" Olds. Two distinct versions of the 400 CID engine were made:

• 1965-1967 "Early" 400s used a slightly oversquare {{cvt|4.000|in|mm|2}} bore and {{cvt|3.975|in|mm|2}} stroke for an overall displacement of {{cvt|6549|cc|CID|1|disp=flip}}. All the pre-1968 engines used a forged steel crankshaft.

File:1969 Oldsmobile Ram Rod 400 engine in 442 W30.jpg

The 1966-1967 4-4-2 {{cvt|400|CID|L|1}} V8 was a short stroke engine which featured B and C cast large-valve cylinder heads and hydraulic lifters of larger diameter, as well as push-rods of different length and diameter than the standard Olds Rocket V8. It was rated at {{cvt|350|hp|kW|0}} and {{cvt|440|lbft|Nm|0}} of torque with a Rochester 4-barrel, and {{cvt|360|hp|kW|0}} with the L69 tri 2-barrel option in 1966. A nominal 360 hp was claimed in 1967 when equipped with a W30 camshaft, 4-barrel, and outside air induction, 502 of which were factory produced. They were all painted Bronze and had V and G stamped on the cylinder heads.

• 1968 and 1969 400s shared the Olds big-block standard {{cvt|4.25|in|mm|2}} stroke with the 455 but used a undersquare {{cvt|3.87|in|mm|2}} bore to comply with GM's maximum 400 cu. in. displacement restrictions in the A-body cars while also reducing tooling costs. Displacement is similar to the earlier engine, at {{cvt|6554|cc|CID|1|disp=flip}}. This "later" 400 is considered less desirable by many enthusiasts, because of the power band characteristics induced by this undersquare format, although the actual change in power was due to the mild 250/264 duration cam used in this engine (previous 400s used a 278/282 cam){{citation needed|date=December 2014}} and the fact that the crankshafts were now made of cheaper less durable high nodular iron material.

:"Early 400s" used the same forged steel crankshaft as the 425, while "later 400s" used the same cast iron crankshaft of the 455, with rare exceptions; some 1968 and later Olds 400/455s were produced with forged steel crankshafts. These rare cranks can be readily spotted by the J-shaped notch in the OD of the rear flange; cast iron cranks have a C-shaped notch. All 1965-1969 Olds 400s were painted bronze.

The {{cvt|6.967|L|cc cuin|adj=ri1|sigfig=4}} big-block was the first tall-deck "big block," produced from 1965 through 1967. It is arguably the best engine Olds made in the muscle car era, although it never made it into a "muscle car". It used a {{cvt|4.126|in|mm}} bore and {{cvt|3.975|in|mm}} stroke. Most 425s were painted red, though the 1966 and 1967 Toronado units were light blue. All 425 engines were fitted with forged steel crankshafts with harmonic balancers.

The standard 1965-1967 {{cvt|425|CID|L|1}} was called the Super Rocket, and was the most powerful engine option for the Oldsmobile 88 and 98 of 1965-1967. Compression ratios of 9.0:1 at {{cvt|310|hp|kW}} or 10.25:1 at {{cvt|360|hp|kW}} were available in the U.S.

A special 1965-1967 {{cvt|425|CID|L|1}} V8 was the Starfire engine. The main distinguishing features of this engine were a slightly different camshaft profile from the standard ultra high compression engine and factory dual exhaust. This engine was only available in the Oldsmobile Starfire, delta 88 and a performance economy model called the Jetstar I. It shared the same compression ratio of the Toronado Rocket at 10.5:1. It also used the .921 in lifter bore size of the Toronado Rocket.

File:1967 Oldsmobile Toronado engine.jpg's 425 V8, the first post-war front-wheel drive V8 application.]]

An Ultra High Compression Toronado Rocket version of the {{cvt|425|CID|L|1}} V8 was made for the 1966 Toronado. It had the same {{cvt|0.921|in|mm}}-diameter lifters of the first-generation Oldsmobile engines, rather than the standard {{cvt|0.842|in|mm}}, which let engineers increase the camshaft's ramp speed for more power, {{cvt|385|hp|kW}}, without sacrificing idle or reliability. Unlike all other 425s, this version was painted slate blue metallic.

File:Oldsmobile Rocket 455 V8 engine in a 1968 Delmont 88.jpg]]

The 425's stroke was lengthened to {{cvt|4.25|in|mm}} to achieve {{cvt|7449.5|cc|cuin L cc|1|adj=ri0|order=out}} to create the Rocket 455 for 1968. It kept the retired 425's {{cvt|4.126|in|mm}} bore to produce between {{cvt|275|and|400|hp|kW|0}}. Initially the paint was red, except for metallic blue in the Toronado applications; 1970-1976 versions were metallic blue at first, then nonmetallic blue. The "Rocket" name disappeared from the air cleaner identification decal after 1974. Although production of the 455 ended in 1976, a small number were produced through 1978 for power equipment use, such as motorhomes, boats and irrigation equipment.{{cite web

|url=https://oldsjunction.classicoldsmobile.com/oldsfaq/ofeng.htm

|website=Oldsjunction.Classicoldsmobile.com

|title=Engines

|first1=Bob

|last1=Barry

|first2=Joe

|last2=Padavano

|access-date=September 9, 2018}}

Applications:

• Oldsmobile Cutlass
• Oldsmobile Vista Cruiser (1970–76)
• Oldsmobile Custom Cruiser
• Oldsmobile 4-4-2
• Oldsmobile Hurst/Olds, {{cvt|390|hp|0}}{{cite web

|url=https://www.myclassicgarage.com/knowledge-base/1968-Oldsmobile-442

|title=1968 Oldsmobile 442 performance specs

|website=myclassicgarage.com

|language=en-US

|access-date=2018-06-10}}{{cite web

|url=http://www.oldsmobilesforever.com/442%20History.htm

|title=Oldsmobile 442

|website=oldsmobilesforever.com

|language=en-US

|access-date=2018-06-10}}

• Oldsmobile 88
• Oldsmobile 98
• 1968–1970 Oldsmobile Toronado, {{cvt|375|hp|0}}
• 1968–1970 Oldsmobile Toronado GT (W34), {{cvt|400|hp|kW}}
• 1973–1976 GMC Motorhome

{{See also|Oldsmobile Diesel engine#LF9}}

File:GM 5.7l engine.jpg]]

Produced from 1968–1980, the Rocket 350 was entirely different from the other GM divisions' 350s. It used a very oversquare {{cvt|4.057|in|mm}} bore and Oldsmobile small-block standard {{cvt|3.385|in|mm}} stroke for {{cvt|5737|cc|cuin L cc|1|order=out}}. Output ranged from {{cvt|160|to|325|hp|kW|0}}. 1968-1974 350s were painted gold; 1975-1976 350s were metallic blue like the 455; 1977-1980 models were painted GM Corporate Blue. The "Rocket" name disappeared from the air cleaner decal in 1975, the same year that the catalytic converter was added to the emissions control system.

The Oldsmobile 350s made from 1968-1976 have heavy castings, beefier crankshafts, and better flowing heads.{{Citation needed|date=July 2020}} The 1977-1980 350s have lighter castings, including a thinner block with large "windows" in the main bearing bulkheads,{{Citation needed|date=July 2020}} and have crack-prone cylinder head castings{{Citation needed|date=July 2020}} manufactured by Pontiac Motor Division (castings are marked "PMD"; these heads were also used on the 260),{{Citation needed|date=July 2020}} and a lightened crankshaft.{{Citation needed|date=July 2020}}

The 1976-1979 Cadillac Seville was equipped with a version of this engine featuring an analog Bendix/Bosch electronic port fuel injection system, making this the first American mass-produced car with EFI as standard equipment.{{cite web |title=1975-79 Cadillac Electronic Fuel Injection |url=https://www.curbsideclassic.com/automotive-histories/automotive-history-1975-1979-cadillac-electronic-fuel-injection-gms-forgotten-fuelie/ |website=curbsideclassic.com |date=30 July 2021 |access-date=21 November 2021}}

Applications:

• 1976-1979 Cadillac Seville
• 1980 Cadillac Seville
• 1979 Cadillac Eldorado
• 1968-1977 Oldsmobile Cutlass
• 1968–1977 Oldsmobile Vista Cruiser
• 1973-1977 Oldsmobile 4-4-2
• 1968-1980 Oldsmobile Delta 88
• 1977-1980 Oldsmobile 98
• 1979-1980 Oldsmobile Toronado
• 1973-1979 Oldsmobile Omega
• 1977 Pontiac Firebird (Firebirds sold in California/High Altitude states received the 350 Oldsmobile (VIN code "R") for a short time in 1977 before being replaced with the small block Chevrolet line of engines.)
• 1979 Oldsmobile Cutlass Calais (Hurst/Olds W-30 VIN "R" code)
• 1980 Oldsmobile Cutlass Calais (442 W-30 VIN "R" code)

Oldsmobile's own L34 R code {{convert|350|CID|L|1|adj=on}} V8 was used in the 1976 Oldsmobile Cutlass "S", 1979 Hurst/Olds models and 1980 "4-4-2". The L34 used a 4-barrel carburetor and produced {{cvt|170|-|190|hp|kW}} and {{cvt|295|ft.lbf|N.m}}.

The 455 big block Olds V8 was replaced in 1977 with the {{cvt|6598|cc|cuin L cc|1|order=out}} small block, which used a {{cvt|4.351|in|mm|1}} bore, the largest ever used in a small-block V8, with the Olds small-block standard deck and {{cvt|3.385|in|mm}} stroke. The bore was so wide that the cylinder walls were siamesed, as in the Chevrolet 400 V8, with no space for coolant to flow between the cylinders. Additionally, the 403 had windowed main webs, which reduced the internal strength of the block in the crankcase area. It has been purported that there is a 403 Oldsmobile block and cast that has solid main webs that may have been equipped in vehicles such as the Pontiac Firebird equipped with a towing package, but there are currently no clearly documented surviving examples.

The 403 is fundamentally the exact same block as an Oldsmobile 350 V8, however it features a larger bore. Most components and accessories are interchangeable. A popular modification made to the 403 to increase power was to swap on early Oldsmobile 350 heads to boost compression.{{cite magazine | url=https://www.motortrend.com/how-to/ccrp-1105-oldsmobile-403-engine/ | title=Oldsmobile 403 Engine | magazine = Car Craft Magazine | date=May 2011 }} The 403 was never featured with a manual transmission and the crank was never manufactured for a pilot bearing. It was generally paired with the Turbo Hydramatic 350 3-speed automatic or the Turbo Hydramatic 400 3-speed automatic in rear wheel drive vehicles, in the case of front-wheel drive vehicles, the Turbo Hydramatic 425 FWD 3-speed automatic. It always featured the 4A 83cc heads with 8:1 compression, and a Rochester Quadrajet 4-barrel carburettor. The 403 Oldsmobile was generally painted "Corporate GM Blue" on every model line it was equipped in.

The Olds 403 was used by Buick and Pontiac in addition to Oldsmobile until its discontinuation after 1979. Output was {{cvt|185|hp|kW}} and {{cvt|320|lbft|N.m}}. Uniquely in the 1977 Toronado, the 403 engine was fitted with a crank triggered ignition system.{{cite web | url=https://classicoldsmobile.com/forums/general-discussion-33/distributerless-78-toro-403-a-87142/ | title={{as written|Distribut|erless [sic]}} 78 Toro 403? }} Parts peculiar to this system include a toothed disc between the harmonic balancer and the crank pulley, the "adjacent sensor" (an early form of crankshaft position sensor), a special distributor, an engine temperature sensor, and a rudimentary computer mounted inside the car, under the dashboard.

Applications:

• 1977 Buick Century Estate
• 1977–1978 Buick Riviera
• 1977–1979 Buick Electra
• 1977–1979 Buick Estate Wagon
• 1977–1979 Buick LeSabre
• 1977 Oldsmobile Cutlass
• 1977 Oldsmobile 4-4-2
• 1977 Oldsmobile Vista Cruiser
• 1977–1978 Oldsmobile Delta 88
• 1977–1978 Oldsmobile Toronado
• 1977–1979 Oldsmobile 98
• 1977–1979 Oldsmobile Custom Cruiser
• 1977 Pontiac Bonneville
• 1977-1979 Pontiac Catalina Safari
• 1977-1979 Pontiac Firebird
• 1977 Pontiac Grand Prix available with California Emissions Only
• 1977-1978 Pontiac Grand Safari available with California Emissions Only
• 1977 Pontiac Can Am available with California Emissions Only
• 1977–1978 GMC Motorhome

{{See also|Oldsmobile Diesel engine#LF7}}

A smaller {{cvt|4269|cc|cuin L cc|1|order=out}} V8 was created for the new Oldsmobile Omega in 1975 by decreasing the bore to {{cvt|3.5|in|mm}}.{{cite book | ref = SCO | title = Standard Catalog of Oldsmobile 1897–1997 |first1 = John |last1 = Chevedden |first2 = Ron |last2 = Kowalke |publisher = Krause Publications | date = 2012 | location = Iola, WI | page = 130 | isbn = 978-1-4402-3235-0 }} It produced {{cvt|110|hp|kW}} net and {{cvt|205|lbft|N.m}}. SAE gross power was 150 hp.Chevedden and Kowalke, pp. 128, 131, 135 The 260 V8 received VIN code "F" and had a sales code of LV8. This was the first engine to use the smaller Rochester Dualjet two-barrel carburetor, the only carburetor used on the 260.{{Citation needed|date=July 2020}} Production of the 260 V8 ended in 1982 when the 307 became the only gasoline V8 in Oldsmobile's line. The 260 was designed for economy, and was the first engine option above the Chevrolet 250 straight-six, then later the 3.8 L Buick V6, which was standard fitment in many Oldsmobile models by the late 1970s. While the 260s were not very powerful compared to the larger 350 and 403 V8s, fuel economy was almost as good as the base V6.{{Citation needed|date=July 2020}} Compared to the V6, the 260 was also smoother-running, and far more durable.{{Citation needed|date=July 2020}} Most 260s were coupled to the Turbo Hydramatic 200 transmission,{{Citation needed|date=July 2020}} but a 5-speed manual transmission was also available in some vehicles.

Applications:

• 1975–1977 Pontiac Ventura
• 1975-1977 Pontiac LeMans
• 1975–1982 Oldsmobile Cutlass
• 1975-1977 Oldsmobile Omega
• 1975-1977 Buick Skylark
• 1977-1982 Oldsmobile 88

A slightly larger {{cvt|5.033|L|cc cuin|adj=ri1|sigfig=4}} version was introduced in 1980. It uses a {{cvt|3.8|in|mm}} bore (in common with the Buick 231 V6 and 350 V8) with a {{cvt|3.385|in|mm}} stroke. Some early 307s were painted GM Corporate blue, but most were painted satin black. It was used in most Oldsmobile models, as well as those from Buick, Cadillac, Chevrolet, and Pontiac. Every 307 used a four-barrel carburetor, which was a variant of the Rochester Quadrajet, usually the CCC (Computer Command Control) Quadrajet.

The output of the 307 wasn't particularly high in terms of horsepower. For example, the stock (non-high-output, VIN "Y") {{cvt|307|CID|L|1}} in the 1983 Oldsmobile 98 was a mere {{cvt|140|hp}}, although in that year a high-output model (VIN "9") was available producing a nominal {{cvt|180|hp}}, at approximately {{cvt|245|lbft|N.m}} torque. The final 1990 configuration was rated at {{cvt|140|hp}} at 3200 rpm and {{cvt|255|lbft|N.m}} of torque at 2000 rpm. The combination of good torque at low engine speeds, the Quadrajet four-barrel carburetor, and the THM-200-4R three-speed plus overdrive automatic transmission having a lockup torque converter allowed for decent performance, and fuel economy considered reasonable for the era, even in the larger and heavier model cars. The engine is also known for its reliability, smoothness and quietness.

Applications:

• 1980–1985 Oldsmobile 88
• 1980–1984 Oldsmobile 98
• 1980–1985 Oldsmobile Toronado
• 1980–1990 Oldsmobile Custom Cruiser
• 1980–1985 Buick Lesabre
• 1980–1984 Buick Electra
• 1980–1985 Buick Riviera
• 1980–1990 Buick Estate Wagon
• 1986–1987 Buick Regal
• 1986–1990 Chevrolet Caprice Wagon
• 1986–1987 Cadillac Brougham VIN "9" (Includes Early Model 1988 Broughams made in 1987)
• 1981 Pontiac Bonneville
• 1986 Pontiac Parisienne The 307 was fitted in some late model 1986 Parisienne's while others had the Chevy 305

Oldsmobile used the popular LV2, a {{convert|307|CID|L|1|adj=on}} engine, commonly known by the VIN code "Y", from 1980-1990. It was used by every domestic GM automobile marque except for GMC and Saturn. In 1985, roller lifters, floating piston wrist pins, and swirl port intake runners were added. The 307 "Y" produced {{cvt|148|hp}} and {{cvt|250|lbft|N.m}} in 1980-1984 models and {{cvt|140|hp}} and {{cvt|250|lbft|N.m}} in 1985-1990s. All LV2s feature a 4-barrel carburetor.

Y-version applications:

• 1980–1985 Buick Lesabre
• 1980–1985 Buick Riviera
• 1986–1987 Buick Regal
• 1986–1990 Chevrolet Caprice
• 1980–1985 Oldsmobile 88
• 1980–1984 Oldsmobile 98
• 1980–1985 Oldsmobile Toronado
• 1980–1990 Oldsmobile Custom Cruiser
• 1980–1981 Oldsmobile Cutlass
• 1982–1987 Oldsmobile Cutlass Supreme
• 1988 Oldsmobile Cutlass Supreme Classic
• 1983–1986 Pontiac Parisienne VIN "Y"
• 1987-1989 Pontiac Safari
• 1988–1990 Cadillac Brougham VIN "Y"

====LG8====

The LG8 was a modern {{cvt|307|CID|L|1}} High-Output derivative of the LV2 produced from 1983 to 1987. Performance modifications included a "hot" camshaft (in reality, just a camshaft used in various applications during the '70s with .440"/.440" lift and 196°/208° duration at .050"), stiffer valve springs, a larger vibration damper (same as all '73-'79 350s, 403s, and 455s), a Y-pipe dual-outlet exhaust system, and richer secondary metering rods in the carburetor. It was offered in the Hurst/Olds version of the Oldsmobile Cutlass Calais and in the 4-4-2 version of the Oldsmobile Cutlass Salon. Output for 1983-1985 was {{cvt|180|hp|kW}} and {{cvt|245|lbft|N.m}}. Revisions to the engine for 1986 included roller lifters with a slightly smaller camshaft (.435"/.438" lift and 194°/210° duration at .050"), new heads with smaller, swirl-port intake runners, floating piston pins, and larger piston dishes for lower compression (8.0:1 v. 8.4:1). These changes increased torque to {{cvt|250|lbft|N.m}} but lowered power to {{cvt|170|hp}}, while lowering the RPM at which peak power and torque was achieved.

Applications:

• 1983–1984 Hurst/Olds
• 1985–1987 Oldsmobile 4-4-2
• 1985–1988 Cadillac Brougham VIN "9"

File:R. E. Olds Transportation Museum July 2018 09 (1990 Oldsmobile V8 engine).jpg]]

The Generation II V8 ended production in 1990. The company later introduced a new vehicle, the Oldsmobile Aurora, with a new generation V8. Based on the Cadillac Northstar engine, this 4.0-liter engine, called Aurora, was a DOHC design with four valves per cylinder. Apart from the Oldsmobile Aurora, the Aurora V8 was also used in the Shelby Series 1.

From the 1950s through the late 1970s, each GM division had its own V8 engine family. Many were shared among other divisions, but each design was unique:

• Buick V8 engine
• Cadillac V8 engine
• Chevrolet Small-Block engine
• Chevrolet Big-Block engine
• Pontiac V8 engine
• Holden V8 engine

GM later standardized on the later generations of the Chevrolet design:

• GM LT engine - Generation II small-block
• GM LS engine - Generation III/IV small-block
• List of GM engines

{{reflist}}

{{commons category}}

{{GM late engine timeline}}

V8

Category:V8 engines