Question: Is A 400 Pontiac A Big Block?

Is Pontiac 455 and 400 the same block?

The 400 and 455 blocks share the same size externally, but they are two different blocks internally.

The 400 has a 4.12″ bore and the 455 has a 4.151″ bore, but the most you can go is 4.18″ on the 400- also a good idea not to go beyond ..

Is a Pontiac 400 the same as a Chevy 400?

Ehhhhhhhhhhhh, the Pontiac 400 has the same bore and stroke as the 400 chevy. It has 3 inch mains that soak up 80hp from the overall flywheel horsepower figure, not!

What does GTO stand for in the Pontiac?

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.

What’s the difference between a Chevy 350 and a Pontiac 350?

So basically the Chevy 350 is smaller, lighter, and can be made to run much better. The Pontiac 350 is bigger, heavier, and will never run near the Chevy.

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.

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 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 big block better than a small block?

A big block engine is physically larger and weighs more than a small block. [4] Larger bores, longer strokes, bigger valves and ports can lead to truly astounding power production. If a small block is a quick and nimble welterweight boxer a big block can be devastating heavyweight.

Did Pontiac make a 428 engine?

The Pontiac 428 cubic inch engine was used only from 1967-69. It was one of the largest engines Pontiac produced, but it was used more to power big cars such as the Bonneville, and not as much for performance cars such as the Firebird.

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.

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.

How much does a Pontiac 400 block weigh?

about 650 poundsthe bare block is about 165 pounds, they are all the same block other than for bore and stroke unlike Chevy which has “small block” and “big block”. A complete block with crank and cast iron heads and aluminum intake is about 650 pounds.

What is the most powerful small block engine?

LS9 engineThe most powerful small block ever produced is the LS9 engine used in the current Corvette ZR1. It is rated at 638 horsepower, making it the most powerful engine ever produced by GM for a regular-production car.

What is the best small block Chevy engine?

The 327 L84 remained the most powerful Chevrolet small block production engine ever until the quad-cam LT5 came out in the 1990s. And it was the most powerful naturally-aspirated single-cam small block until the arrival of the LS6 engine in the early 2000s.

What did a 400 small block come in?

The 400 small block Chevy was produced from 1970 until 1977. It was originally installed in big sedans and wagons, but later found its way into some trucks. I don’t believe it was ever put in the Chevelle or Camaro. A co-worker has a very healthy 400 in his ’88 Corvette.

Can you make a 305 fast?

EG: the Monte Carlo SS 305 motor came with a special 3000 stall lockup converter and 3.73’s. To start with pull off one valve cover and get the cylinder head csting number off your heads. Yes you can make your 305 fast.

How much horsepower does a 400 Pontiac have?

Engine. In the 1968 Pontiac GTO, the 400 cubic-inch V-8 was tuned to deliver 360 horsepower and 445 foot-pounds of torque, or pulling power. The engine had a bore and stroke, or size of the cylinder and distance it travels, at 4.125 and 3.75 inches.

What’s the difference between a 400 small block and a 400 big block?

Though big-block engines are significantly larger than their small-block brethren, the true difference between these two is more about displacement, bore, and stroke than strictly size. Typically, big-block engines have displacements of greater than 400 cubic inches and small block engines have a smaller displacement.

How much does it cost to rebuild a Pontiac 400 engine?

There are those of us who have rebuilt a 400 or 455 from an engine core, so we know what a quality rebuild costs- you’re going to spend $1500-2000 on parts alone and another $750-1000 on machine work (figure another $800-1500 for professional assembly).

How much horsepower does a Oldsmobile 455 have?

365 hpIts 455-cu.in. engine, which was introduced in 1968 and featured in the Hurst Olds, Toronado and full-size models, became the standard 4-4-2 powerplant, rated at 365 hp.