Question: Is A Pontiac 400 Engine A Big Block?

How much can you bore a Pontiac 455?

Pontiac Engine Torque SpecsPONTIAC ENGINE CHARTENGINESTROKE455 CU.

IN.Stock Bore4.21030 over60 over32 more rows.

Is Pontiac 455 and 400 the same block?

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.

How much horsepower does a Pontiac 400 engine have?

360 horsepowerThe 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. What sets this engine apart in the history books is the factory-installed high-performance Ram Air systems.

Is a Pontiac 400 a good engine?

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.

What does the GTO stand for?

Gran Turismo OmologatoThis ritual is summarized by the three most famous letters ever worn by an automobile: “GTO” stands for “Gran Turismo Omologato,” which, loosely translated from the Italian, means homologated (recognized for competition) grand-touring car. Enzo could have christened his car “the ultimate,” and we wouldn’t quibble.

What size motor is a 6.6 L?

GM 6.6L L8T SpecsEngine:6.6L L8T V-8Displacement:400.55 CID (400 CID nominal), 6.56 liters (6.6 liters nominal)Configuration:V-8Bore:4.065 in (103.25 mm)Stroke:3.858 in (98.0 mm)24 more rows

Are Oldsmobile and Pontiac 455 the same?

There’s no question that 455 cubic inches of displacement equal a big motor. … In the beginning, you would find them in Oldsmobile Motor Division products. As time went on you started seeing this exact displacement under the hood of Buicks and performance models from the Pontiac Motor Division.

How much horsepower does a Pontiac 455 have?

The result was the 1970 Pontiac GTO 455, which was stuffed with a beefy 455 HO V8 long-stroke engine. 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 a 400 small block better than a 350?

A small block 350 and a 400 have an identical block design. Most accessories will fit either engine. The major difference is found in the casting numbers and the way they are balanced. Most 350 cubic inch engines are internally balanced whereas the 400 engines are not.

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.

Does Pontiac have a big block?

Pontiac differed from most other manufacturers in that the external dimensions of all their V8s, from 326–455 cu in (5.3–7.5 L) were the same. … Pontiac did not have the customary “small-block” and “big-block” engine families common to other GM divisions as well as Ford and Chrysler.

Is a Pontiac 400 a small or 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 biggest Pontiac engine?

The 455-cu.in. V-8 debuted in 1970 and was the largest displacement Pontiac engine ever built for the street.

How much HP does a 400 big block have?

In this application, the 400 had a four-barrel carburetor, had the same 8.2:1 compression, and was rated at 195 horsepower and 305 pound-feet of torque….Premium Member.1976horsepowertorque2-barrel1753004-barrel HP2403251 more row•Nov 16, 2020

Did Pontiac make a 428 engine?

The 428 was Pontiacs top engine for 3 short years- 1967-9. The bore is the same as the 400 at 4.12″. The stroke is 4″, the main journals are 3.25″. The 428 has remained one of the favorite Pontiac engines for racers and hot rodders and, are always one of the most sought after for a build up.