Exhaust manifolds,these look interesting

[Ricko1966]

In the 60s hp models got exhaust manifolds with 2.5 inch outlets. Everything else got 2" manifolds. Hooker came out with some 2.5 inch outlet manifolds,but if you look 1988-1995 Chevy trucks got 2.4 inch outlet manifolds and they are less than 1/3rd the price of hookers. Will they fit IDK yet.Your guess is as good as mine,but they are definitely interesting,I think this summer I'm going to try some.

 

[CalSgt]

In the 60s hp models got exhaust manifolds with 2.5 inch outlets. Everything else got 2" manifolds. Hooker came out with some 2.5 inch outlet manifolds,but if you look 1988-1995 Chevy trucks got 2 4 inch outlet manifolds and they are less than 1/3rd the price of hookers. Will they fit IDK yet.Your guess is as good as mine,but they are definitely interesting,I think this summer I'm going to try some.

I can say ‘96-‘99 SBC manifolds fit nice in a SB frame, I assume the other GMT400 manifolds are close to the same

 

[HotWheelsBurban]

I can say ‘96-‘99 SBC manifolds fit nice in a SB frame, I assume the other GMT400 manifolds are close to the same

I'd think they would tuck in to the engine nicely, since a GMT 400 chassis/engine compartment is a bit tighter than an early (73-80) square body truck.

 

[Ricko1966]

What is the outlet diameter? Meant for#2 ^^^

 

[xm20k]

If you're doing truck stuff and running under 5000RPM making 350 or less, manifolds I don't think will matter much from what I've seen. Soon as you start stretching its legs and/or making more power a set of cheap headers are probably better N/A when running a full exhaust system.

I've seen GM use different size outlets on so many different combinations it really didn't seem to make any sense power or performance wise, all making around the same numbers so no clue.

 

[xm20k]

Also, the ones pictured will fit basically every SBC in almost any car or truck application.

The exceptions are the rams horn manifolds the very early SBC (late 50s-early 60s) look kind of similar to the stock ones on our trucks but dumped in a different place (vertical between the last 2 cylinders on the passenger side and higher up) and the log style manifold that sits above the spark plugs.

The weird log over the plugs I think was for some limited space applications.

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