Typical header dimensions

[Bob F]

Originally Posted by B Parker

I run a 402 BBC in stock. I use a 1 7/8 to 2 inch primary. I'm sure you are not that far off with a 2 inch Hooker. Most of the guys that run BBC high HP cars in stock use a 2 to 2 1/8. I would be surprised if you could pick up a tenth with a header change. For the kind of money you would spend on a good set of headers you could find more ET with something else. BP

What class do you run BParker?

[B Parker]

I run A and B stock auto. I believe I have one of the faster ones but with the AHFS most of us have blocks under our gas pedals. BP

[Randall Klein]

A little off topic, but just wondering anyone's opinion on dimpling tubes to fit.

Engine Masters (Frieberger) has video on just crushing tubes to little effect

[GTX JOHN]

Jack Davis (RIP) told me that you could ding the Header quite a
bit without hurting Air Flow.

He has been gone a while but I still replicate the Step headers
and Merged Collector he made for me on all my cars!

[B Parker]

Originally Posted by Randall Klein

A little off topic, but just wondering anyone's opinion on dimpling tubes to fit.

Engine Masters (Frieberger) has video on just crushing tubes to little effect

Years ago my brother crushed a primary tube taking the car out of a trailer. He ran the car and it did nothing to the ET. BP