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-   -   Typical header dimensions (https://classracer.com/classforum/showthread.php?t=78532)

Terry Cain 02-10-2021 12:45 PM
Re: Typical header dimensions
 
Quote:
Originally Posted by 1uke (Post 634068)
I’m hunting around to drop up a tenth or 2 that’s all.
Maybe grasping at straws during the winter boredom....
There's faster pipes than Hooker.

Jim Caughlin 02-10-2021 01:57 PM
Re: Typical header dimensions
 
Quote:
Originally Posted by bert powell (Post 634076)
My SS 402 likes 1 7/8" step to 3.25 throat merge collector for what it is worth.
As a header builder who has built several sets for these types of combinations, I think your sizing (1 7/8 with merged collector) is probably correct. 2" primary with 3 1/2 collector is likely too large. I am constantly trying to convince people that they want too large of tube sizes.

bert powell 02-10-2021 04:49 PM
Re: Typical header dimensions
 
Quote:
Originally Posted by Billy Nees (Post 634077)
And I'm guessing that it's an oval-port combo?
That's right Billy, that is why I said for what it is worth. You are dead on with the 427/425. I just noticed he had a 402.

Barry Polley 02-11-2021 12:39 PM
Re: Typical header dimensions
 
PM sent Jim.

Kenny Wigington 02-11-2021 07:20 PM
Re: Typical header dimensions
 
Does anyone still use the exhaust valve size in the calculation ? I heard that for years. It made some sense, as far as primary pipe size.

B Parker 02-11-2021 10:20 PM
Re: Typical header dimensions
 
Quote:
Originally Posted by 1uke (Post 634068)
I’m hunting around to drop up a tenth or 2 that’s all.
Maybe grasping at straws during the winter boredom....
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

Bob F 02-12-2021 07:42 AM
Re: Typical header dimensions
 
Quote:
Originally Posted by B Parker (Post 634178)
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 02-12-2021 08:36 PM
Re: Typical header dimensions
 
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 02-13-2021 01:03 PM
Re: Typical header dimensions
 
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 02-13-2021 06:32 PM
Re: Typical header dimensions
 
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!


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