The basic 421 became a regular production option in 1962 and the 421 H.O. with Tri-Power induction was Pontiac's hottest street engine. Pontiac's 389- and 421ci V8s were steadfastly popular and powerful.13 Apr 2016
Did Pontiac make a 455 cubic inch engine?
Of the three 455 cubic inch V8 engines offered by General Motors in 1970, the Pontiac 455 took the most unusual route to the market. Unlike Oldsmobile and Buick, which had both big block and small block engines on the shelf, Pontiac had been developing the same eight-cylinder formula since 1955.20 May 2021
When did Pontiac start using Chevy engines?
In 1954, General Motors leaned heavily on Chevrolet and Pontiac to develop V-8 engines for the 1955 model year and provided them with all available resources to ensure success.In 1954, General Motors leaned heavily on Chevrolet and Pontiac to develop V-8V-8The S-V8 is powered by a Ford Mustang sourced 4·6-litre (4601 cc), 32-valve, four-cam, V8 engine producing 325 bhp (242 kW; 330 PS), with a top speed of 160 mph (260 km/h) and 0-60 mph in less than five seconds.https://en.wikipedia.org › wiki › Jensen_S-V8Jensen S-V8 - Wikipedia engines for the 1955 model year and provided them with all available resources to ensure success.19 Feb 2015
What is the difference between a Pontiac 400 and 455?
(It's a minor point because) the only differences between the 400 and the 455 >BLOCKS< were the main bearing journal size (3.000″ in the 400 and 3.250″ in the 455) plus the bore size. In all other dimensions the two were identical.
What is the most powerful Pontiac?
Pontiac G8 GXP
How much horsepower does a 455 Pontiac have?
Horsepower and Torque The 455 High Output generated 335 horsepower and 480 foot-pounds of torque for 1970 and 1971. However, power steadily declined beginning in 1972 when Pontiac reduced it to 300 horsepower and 415 foot-pounds of torque.
How much horsepower can you get out of a Pontiac 400?
What cars came with a Pontiac 455?
Development. The Pontiac 455 V-8 was actually a bored out 428-cubic-inch V-8 with a bore and stroke of 4 inches by 4 inches. For the 455, Pontiac expanded the cylinder bore to 4.152 inches and the stroke to 4.21 inches. The 455 powered the Pontiac GTO and Firebird.Development. The Pontiac 455 V-8V-8The S-V8 is powered by a Ford Mustang sourced 4·6-litre (4601 cc), 32-valve, four-cam, V8 engine producing 325 bhp (242 kW; 330 PS), with a top speed of 160 mph (260 km/h) and 0-60 mph in less than five seconds.https://en.wikipedia.org › wiki › Jensen_S-V8Jensen S-V8 - Wikipedia was actually a bored out 428-cubic-inch V-8 with a bore and stroke of 4 inches by 4 inches. For the 455, Pontiac expanded the cylinder bore to 4.152 inches and the stroke to 4.21 inches. The 455 powered the Pontiac GTO and Firebird.
What was the last year Pontiac made the 455?
General Motors produced the Pontiac 455-cubic-inch V-8 engine from 1970 through 1976. The 455 wielded massive horsepower, but a new horsepower rating system and tighter emission controls drove the 455's power lower each year until GM abandoned the engine in 1976.General Motors produced the Pontiac 455-cubic-inch V-8V-8The S-V8 is powered by a Ford Mustang sourced 4·6-litre (4601 cc), 32-valve, four-cam, V8 engine producing 325 bhp (242 kW; 330 PS), with a top speed of 160 mph (260 km/h) and 0-60 mph in less than five seconds.https://en.wikipedia.org › wiki › Jensen_S-V8Jensen S-V8 - Wikipedia engine from 1970 through 1976. The 455 wielded massive horsepower, but a new horsepower rating system and tighter emission controls drove the 455's power lower each year until GM abandoned the engine in 1976.
How much horsepower did the Pontiac 455 have?
Rated conservatively at 360 horsepower and producing a tremendous 500 pound-feet of torque, the 455 HO gave the GTO the powerful aggression needed to appeal to performance-minded buyers.
Is the Pontiac 455 a good engine?
Despite only two years in production run, the 455 H.O. is regarded by many Poncho experts as the most versatile street engine Pontiac ever produced. Gobs of low-rpm torque make it quite responsive in normal driving conditions, and it can instantly turn tires into a smoky haze by standing on the throttle.20 Apr 2018
Is Pontiac 455 and 400 the same block?
We took the question to David Butler of Butler Performance in Lawrenceburg, Tennessee, for his professional opinion. He advises, "With the exception of the mid- to late-1970s PN 500557 casting, we consider all Pontiac 400 blocks functionally identical. The 455 blocks from 1970 to 1976 are also functionally identical.13 Apr 2016
How do you tell a Pontiac 400 from a 455?
As you look there you may find a pretty simple clue that will end your engine identifying search. On 1968–69 428 blocks you will find “428” stamped between the freeze plugs. On blocks produced in 1970 and after, you will find 350, 400, or 455 stamped towards the left side of the front of the block.27 Nov 2017
Is a Pontiac 400 considered a big block?
Ford 332 (5.4 litre) Interceptor big block V8. A Chevrolet Camaro 396 had a big block, but a Pontiac Firebird 400 did not. Buick and Oldsmobile 455s were big blocks, but a Pontiac 455 was not. Thus, segregating engines and engine families into small and big block categories became useful shorthand.15 Feb 2019