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

Bob F 02-08-2021 08:57 AM
Typical header dimensions
 
What’s the typical header sizes used on an A stock bbc?
I run a 402 in my bracket ride and am using a hooker comp header with 2” tubes & a 3”1/2 collector.
Turns low 10’s at 130 plus

Billy Nees 02-08-2021 09:27 AM
Re: Typical header dimensions
 
Looks about right.

GTX JOHN 02-09-2021 03:56 AM
Re: Typical header dimensions
 
Sometimes 2 1/8 on our Max Wedges -I would think
maybe a bit bigger than 2" on Big Block GM.

However, I have not raced a big block Chev. since early 70's
so what the Heck would I know. Maybe a Step starting @ 2" and
going up?

Bob F 02-09-2021 01:05 PM
Re: Typical header dimensions
 
I’d been wondering if the collector is too big @ 3”1/2

Billy Nees 02-09-2021 03:31 PM
Re: Typical header dimensions
 
I would say no....

GTX JOHN 02-09-2021 11:08 PM
Re: Typical header dimensions
 
I agree with Billy.

L.Fite 02-09-2021 11:21 PM
Re: Typical header dimensions
 
Quote:
Originally Posted by GTX JOHN (Post 634014)
Sometimes 2 1/8 on our Max Wedges -I would think
maybe a bit bigger than 2" on Big Block GM.

However, I have not raced a big block Chev. since early 70's
so what the Heck would I know. Maybe a Step starting @ 2" and
going up?
A "stock" BBC exhaust port is right at 1-7/8 in it's major dimension, maybe slightly more or less.
(Measured with a tape.)
So there's that...

Bob F 02-10-2021 07:32 AM
Re: Typical header dimensions
 
I’m hunting around to drop up a tenth or 2 that’s all.
Maybe grasping at straws during the winter boredom....

bert powell 02-10-2021 12:24 PM
Re: Typical header dimensions
 
My SS 402 likes 1 7/8" step to 3.25 throat merge collector for what it is worth.

Billy Nees 02-10-2021 12:33 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.
And I'm guessing that it's an oval-port combo?


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