olds 350 header input

[Blake442]

...Thornton has created their own version of the W/Z manifolds to fit small blocks...

Ah, this was where I got mixed up.
My buddy must have the Thornton versions. I didn't realize they were that different...

 

[DoubleV]

...Thornton has created their own version of the W/Z manifolds to fit small blocks...

Ah, this was where I got mixed up.
My buddy must have the Thornton versions. I didn't realize they were that different...

What are his opinions of them? Any proof they perform better than stock? I have a set of ported ones, but can't install them untill the weather gets better...

 

[Blake442]

It's just a street car, so He doesn't have any numbers to back up any potential improvement like dyno/e.t.'s...

He's happy with them, that's all I know.