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Are all Pontiac blocks the same?
The blocks of all Pontiac V-8s from the 287 to the 455 are the same size and very close to the same weight, which can make it more difficult to identify the 11 different engine displacements produced from 1955–79. Adding to the confusion, multiple block codes were used, and date codes can overlap up to three decades.
Is Pontiac 455 and 400 the same block?
Around 40 years have passed since Pontiac assembled its last 400 and 455s.
What is the bore of a Pontiac 455?
Pontiac Blocks- Bore and Stroke
| PONTIAC ENGINE CHART | ||
|---|---|---|
| ENGINE | BORE | |
| 455 CU. IN. | Stock Bore | 4.151 |
| 30 over | 4.181 | |
| 60 over | 4.211 |
Is the Pontiac 400 a small block?
On the other hand, a Ford 332 V8 was in fact a big block. 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.
Did Pontiac make a 455 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.
How much horsepower does a Pontiac 400 engine have?
The 400 remained in production through the 1978 model year, with 1979 cars receiving engines produced the previous year. In basic 2-barrel form it produced 290 horsepower and 428 ft. pounds of torque in 1968. This was the engine installed in Pontiac’s “executive” line of large cars and its largest station wagon.
How much HP can you get out of a Pontiac 400?
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, |
How much horsepower can a Pontiac 400 make?
Back in the day, the most powerful 400 (Ram Air IV) made by Pontiac put out 370 hp (GTO), so 512 hp is certainly a ton more performance; all in, it’s a package that looks deceptively stock.
When did Pontiac start putting engines in the sides of blocks?
Pontiac began casting displacements in the sides of the block (among other places) in the late ‘60s. This practice started with the 428s in 1968. 455s received the identifiers in 1970 when they replaced the 428s. FYI: In 1977, only the 350 and 400 c.i.d. engines remained.
How do I know if my Pontiac has a 301 block?
The 301 can easily be recognized by the lateral oil filter location. In other words, the 301 oil filter sticks straight out, unlike other Pontiac blocks which are attached to a housing that aims the oil filter downward. A wide variety of specific engine/trans codes are stamped into the front of production blocks.
What is the difference between a Pontiac 301 and 301 Turbo?
The 301 hadn’t been designed for this sort of application, so Pontiac engineers added a higher-capacity oil pump and somewhat beefed up the engine. So, the 301 Turbo was upgraded over the standard 301.
Where is the displacement stamp on a Pontiac 350 Block?
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. There is no displacement stamp for 421, 389 or 326 blocks. Pontiac Date Code on the Cylinder head Reggie Horning Engine Casting Number Reggie Horning