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.
A 400 has a standard bore of 4.120 inches. A 455 has a standard bore of 4.150 inches. By using a standard bore 455 piston in a . 030-over 400 block, you end up with a standard bore 455 on 3-inch mains.
With a 4.375-inch bore size, a monstrous 601 cubes of displacement could be created.
This 601-Inch Fuel-Injected Pontiac Could Be The Biggest Pump-Gas Poncho On The Planet.
| Dyno Results: Superflow 902 |
|---|
| Dyno STP Correct Factor Tested at Westech |
|---|
| RPM | TQ | HP |
| 3,600 | 685 | 469 |
| 3,800 | 707 | 511 |
The Pontiac 400 features a 4.121in bore and 3.75in stroker, while the Chevy 400 features a 4.125in bore and 3.75in stroke.
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.
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.
Hi, If i recall right,350 Pontiac doesen't use same block as 400.455 and 400 does. Outer dimensions are the same but bore and stroke aren't. 400 has 4.12" bore and 350 has smaller 3.875,so 350 can't be bored to 400 dimension. It will be cheaper and easier to find 400 or 455.
The Legendary Pontiac Trans Am Firebird Is Making A Comeback. The legendary Pontiac Trans Am Firebird has been discontinued for some time now, but thanks to a company known as the Trans Am Depot, there will be a 2021 model for the vehicle.
On April 23 a report was published stating the company would be dropping the Pontiac brand while preserving the GMC truck line, and the Chevrolet, Cadillac, and Buick brands. The decision to eliminate Pontiac was made primarily due to the increasing threat of a bankruptcy filing if the June 1 deadline could not be met.
Why Did GM Discontinue Pontiac? There were two primary reasons for GM's decision to dispense with the brand. Pontiac has been unprofitable during the last few years of its existence. This put Pontiac in a fatal position given that GM was experiencing severe financial problems ahead of its bankruptcy in 2009.
Pontiac was a car brand owned, made, and sold by General Motors. Franchise agreements for Pontiac dealers expired on October 31, 2010, leaving GM to focus on its four remaining North American brands: Chevrolet, Buick, Cadillac, and GMC.
Very Few Good Pontiac Cars at the End
Obviously, one of the reasons the brand was discontinued is, they just weren't very good cars, to begin with. Out of its 36-member “Worst of the Worst Used Cars” in 2009, three were Pontiacs: Pontiac Aztek; Pontiac G6 (V6); and, Pontiac Montana.History of the Buick and Oldsmobile 455 Engines
- Buick and Olds in the 1960s. Chevrolet's Chevelle, El Camino and Camaro, and the Ford's Mustang, Torinos and Mercury Cougar received the lion's share of credit for producing performance cars.
- Buick 455. Buick produced its 455-cubic-inch V-8 from 1970 to 1976.
- Buick 455 Performance.
- Olds 455.
- Olds 455 Performance.
Welcome to the world's only Pontiac El Camino, better known as “El Catalina.” And, yes, it was built by Pontiac. Trucks actually have played a role in Pontiac's history, going as far back as 1928 when the company produced its last truck before transferring that production into the GMC truck line.
Pontiac Engine Colors
| Year | Color | Part # |
|---|
| 1959 – 1965 | Light Blue | |
| 1966 – 1970 | Light Blue Metallic | MS7957 |
| 1971 – 3/15/1973 | Light Blue | QP14580 |
| 3/15/1973 – 1974 | Dark Blue | |
(The VIN is located on the passenger's side front of the block, down where the timing cover and the oil pan meet.) From 1955 until early 1967, the block unit number represented the last digits of the VIN of the vehicle that the motor was originally installed in.
The Pontiac 400 is big so if someone calls it a big block so what.
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.
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.
400 has 4.12" bore and 350 has smaller 3.875,so 350 can't be bored to 400 dimension. It will be cheaper and easier to find 400 or 455. And those who replied that 350 can be bored and stroked to 383,,,,thats chevy small block engine,not Pontiac.
Displacement began at 287-cubic-inch (4.7 L) and grew as large as 455-cubic-inch (7.5 L) by 1970. Pontiac continued to manufacture its own engines, distinct from Buick, Cadillac, Chevrolet, or Oldsmobile, until 1981.
| Pontiac V8 engine |
|---|
| Dry weight | 550 to 650 lb (250 to 290 kg) |
GM 6.6 Liter V-8 L8T Engine
The L8T is a gasoline engine produced by General Motors for use in Heavy Duty pickup trucks. The engine displaces 6.6 liters in a V8 configuration and an OverHead Valve (OHV) layout otherwise referred to as push-rod.In the vehicle, it's more of a matter of "gearing" than revs. A 327 with it's shorter stroke would need shorter gears so it can GET to its revs, where a 350, with its slightly longer stroke and more torque output will pull a little taller gear than the 327 will. Never underestimate the importance of gearing.
The Chevy 350 cubic inch engine has a 4-inch bore whereas a 400 cubic inch engine has a 4.125-inch bore. The 350 rods are 5.7 inches whereas the 400 has 5.565 inch rods. This is how an engine is stroked—by lengthening the crankshaft stroke and shortening the rod by the same amount.
Even though the small block Chevy vote was split among the various versions, the Chevy 350 still received the most votes out of any engine. Here's sampling of why: “350 sbc. Mass produced, simple design makes it easy to upgrade, parts are cheap, takes tons of abuse, puts out some decent power from stock.
The 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. The lowest-output small block was the 1975-76 262 V-8 rated at 110 horsepower.
The most powerful car GM has ever built is the 2015 Chevy Corvette. With a 6.2 liter V-8 supercharged engine, this bad boy pumps out 650hp.
Dependable Chevys: These are the Most Reliable Silverado Engines
- 6.0-Liter V-8 Hybrid.
- 6.0 L Vortec 6000 V8.
- 5.3-Liter V-8.
- 4.3-Liter V-6.
- 6.2-Liter V-8.
- Duramax 6.6-Liter Turbo-Diesel V-8.
The largest-displacement small-blocks ever produced by GM are the LSX454/LSX454R crate engines offered through Chevrolet Performance, at 454 cubic inches (7.4L); the largest-displacement small-block for a production vehicle is the 427-cubic-inch (7.0L) LS7 used currently in the Corvette Z06.
The difference in the displacement comes from the crankshaft stroke. The 327 uses a 3.25 inch stroke, where the 350 uses a longer 3.48 inch stroke(thats what makes it bigger). Depending on the year of the block, the biggest difference in the block itself is the main journal size.
