BBC header flange dimensions
Thread Starter
Race Director
Joined: Dec 1999
Posts: 16,945
Likes: 9
BBC header flange dimensions
Anyone have these? I have the "horizontal" placement of the ports and the bolt holes but not the vertical, I need it to design a set of flanges so I can have them laser cut from stainless.
Thanks
Marck
Thanks
Marck
Last edited by Twin_Turbo; Nov 23, 2006 at 07:41 PM.
Drifting
Joined: Oct 2003
Posts: 1,426
Likes: 1
From: VetteMOD
St. Jude Donor '05-'07
The bolt holes on a BBC exhaust are vertically spaced .750 inches. However the port is not centered with these bolt holes (either vertically or horizontally). Horizontal spacing is 3.375. If you need the port position, let me know.
Thread Starter
Race Director
Joined: Dec 1999
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I need the port pos. also, I have a coupe of GM power manuals but they only show the head from above and the horiz. spacing of the port centers and the bolt holes from the 0 origin, do you have a side view???
Team Owner
Joined: Apr 2002
Posts: 62,198
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From: All humans are vermin in the eyes of Guru VA
Cruise-In IV Veteran
Cruise-In V Veteran
You could just order a set of header gaskets for a BBC, that would give you a really good pattern, and something you could hand to the laser cut guy as a pattern.
Race Director
Joined: Nov 2000
Posts: 11,872
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From: Waterloo ontario Canada
Originally Posted by Yellow73SB
Twin turbo big block?
Marck as already suggested a header gasket would make a good layout templete. While maybe not stainless you can certainly buy heavy duty 3/8th flanges for the big block. hedman has them as does hooker in 3/8th inch.
Last edited by norvalwilhelm; Nov 24, 2006 at 10:29 AM.
Thread Starter
Race Director
Joined: Dec 1999
Posts: 16,945
Likes: 9
just another project...a little sumt'n sumt'n 
BBShark's excellent drawing is just what the doctor ordered. Any idea on the port sizes...roughly?
Building stainless headers w/ non stainless flanges...that's not gonna work.
BBShark's excellent drawing is just what the doctor ordered. Any idea on the port sizes...roughly?
Building stainless headers w/ non stainless flanges...that's not gonna work.
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