[BRUTAL64]

Originally Posted by enkeivette

Sure there is, it's also been referred to as a chevy small block. You could bore out a 400sbc and use pistons from some other Chevy, although I think all of the big block pistons would be waaay too big for this. You'd be into the water jackets and the pistons would be overlapping eachother.

Can't think of a stock sb crank with more than a 3.75 stroke.

A TRUE Pontiac engine is one size only--except the short deck 4.9. Chevy SB is not a Pontiac engine.

[enkeivette]

Originally Posted by BRUTAL64

A TRUE Pontiac engine is one size only--except the short deck 4.9. Chevy SB is not a Pontiac engine.

What kind of engine do they use in first and second and third gen trans ams?

[BRUTAL64]

Originally Posted by enkeivette

What kind of engine do they use in first and second and third gen trans ams?

First Gen--all Pontiac engines..including SOHC 6 cylinder

Second Gen--All Pontiac V8s till mid seventies. Then some T/As got (calif) Olds 403s. Then in 79 the 4.9 Pontiac short deck showed up.
The straight 6 was a Chevy till about 76 Then the Buick V6 was added.
Some Olds 307s were used and SBCs mid Seventies to 81.

Third and forth gen is all Chevy engines.

A Pontiac engine is the same out side diamention 55 thru 79--except for the short deck 4.9 L.

[enkeivette]

Well Sean and I both can't be wrong. So either there is such thing as a Pontiac sb, or they did use the sbc in the trans am. And from what you just wrote, it looks like both are true.

[94cobra69ss396]

Originally Posted by enkeivette

Well Sean and I both can't be wrong. So either there is such thing as a Pontiac sb, or they did use the sbc in the trans am. And from what you just wrote, it looks like both are true.

What Glenn is trying to tell you is that there isn't small/big block Pontiac engines. There is only one.

Imagine that Chevy never made a big block and only a small block. That's what it's like. You would still have small displacements such as the 283 and large displacements like the 400 but they all use the same exterior dimensions.

[BRUTAL64]

Originally Posted by 94cobra69ss396

What Glenn is trying to tell you is that there isn't small/big block Pontiac engines. There is only one.

Imagine that Chevy never made a big block and only a small block. That's what it's like. You would still have small displacements such as the 283 and large displacements like the 400 but they all use the same exterior dimensions.

Yea, what he said.

[enkeivette]

Originally Posted by 94cobra69ss396

What Glenn is trying to tell you is that there isn't small/big block Pontiac engines. There is only one.

Imagine that Chevy never made a big block and only a small block. That's what it's like. You would still have small displacements such as the 283 and large displacements like the 400 but they all use the same exterior dimensions.

OIC, I would still consider it a small block. Like I consider the LS1, a small block, or even the LS7 a small block. Even though GM isn't currently producing any larger V8s to my knowledge. But I would never call a mod motor, a small block.

[BRUTAL64]

Originally Posted by enkeivette

OIC, I would still consider it a small block. Like I consider the LS1, a small block, or even the LS7 a small block. Even though GM isn't currently producing any larger V8s to my knowledge. But I would never call a mod motor, a small block.

The actual size of a true Pontiac motor is half way between a SBC and BBC.


No true Pontiac engine was called a SMALL BLOCK.

[94cobra69ss396]

My Pontiac build.

455 with 10:1
Cam #9794041
6X Heads ported
'69-'70 R/A-IV or '71 455 H.O. intake manifold.
Rochester carb model 7041263 '71 A, F, G, 400/455 manual trans (high flow)

It should make about 400-420hp at around 5000 and around 500-520tq at about 3000.

[BRUTAL64]

Originally Posted by 94cobra69ss396

My Pontiac build.

455 with 10:1
Cam #9794041
6X Heads ported
'69-'70 R/A-IV or '71 455 H.O. intake manifold.
Rochester carb model 7041263 '71 A, F, G, 400/455 manual trans (high flow)

It should make about 400-420hp at around 5000 and around 500-520tq at about 3000.

6x is not a good head. Edelbrock heads add 50 to 60 hp just bolting them on the 455. The Ram Air IV cam is a GREAT cam!