Are all Pontiac 400 the same?
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.
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Are all Pontiac 400 the same?
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.
What is a Pontiac 400 engine?
The Pontiac 400 engine was used as a high performance engine in sports cars, and it was used in large cars as a workhorse type engine, strong on power, though not as speedy as the higher performance engines. This was accomplished to a large extent by the use of carburetors.
How much horsepower can a Pontiac 400 make?
They found that the engine provided massive amounts of low-end torque and rock steady high RPM power output. The 389 posted numbers in the 330 horsepower range with a single spread-bore, four-barrel carburetor. The 400 pushed this number up to 360 horsepower, with the same Quadrajet single four-barrel.
How much horsepower can you get out of a Pontiac 400 engine?
In the end, No. 97 jets square, 0.030/0.020 valve lash, and 31.5 degrees timing produced 650.4 hp at 6,300 and 596 lb-ft of torque at 4,900 rpm….
| Engine Buildup Worksheet | |
|---|---|
| Engine Displacement | 463 |
| Torque | 596 lb-ft |
| Bore/Stroke | 4.185/4.21-in |
| Block/Crank Combo | 400 block, bored 0.035-in/stock 4.210, |
Is a Pontiac 400 a good motor?
Because of its place in Pontiac’s most brutal and outlandish muscle cars as well as fighting the good fight into the era of smog-choked, low-compression lameness, the Pontiac 400 remains one of our favorite V-8 engines.
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. A Chevrolet 348 was a big block, but a Chevrolet 350 was a small block.
What is the bore size of a Pontiac 400?
With a 4.12-inch bore and a 3.75-inch stroke, Pontiac’s 400 had similar bore and stroke to Chevy’s big-block 396 (even when the Chevy actually displaced 402 cubic inches). As the large-main-journal Pontiac engines found in Pontiac’s full-size cars evolved from 421 to 428 and, finally, 455 cubic inches, Pontiac still went with the well
What is the most powerful Pontiac 400 engine?
The most powerful version of Pontiac’s 400 to ever reach production was the Ram Air IV. With its improved cylinder heads and their round exhaust ports, they’re easy to spot.
What was the last year for the Pontiac 400?
The 400 was inspired by the Pontiac 389 V8 and proved to be the last Pontiac engine with closed chambered heads. At the start of the 1970s, the 400 V8 generated more than 300 horsepower, but decreased to 180 horsepower by the time the last 400 engine was produced in 1978.
What happened to the Pontiac Trans Am 400 engine?
The special edition black and gold Trans Am made famous by Burt Reynolds in the Smokey and the Bandit movie franchise increased Firebird sales in 1977 and 1978 and made the 400 V8 quite popular. Even though production of the 400 had ceased, 1979 Pontiac models still featured the 400 engine due to large stockpiles left over from the previous year.
