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02-10-2021, 12:45 PM | #11 |
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Re: Typical header dimensions
There's faster pipes than Hooker.
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02-10-2021, 01:57 PM | #12 |
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Re: Typical header dimensions
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.
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02-10-2021, 04:49 PM | #13 |
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Re: Typical header dimensions
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02-11-2021, 12:39 PM | #14 |
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Re: Typical header dimensions
PM sent Jim.
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Barry Polley 758 A/SA California Screaming! California- No place to race! |
02-11-2021, 07:20 PM | #15 |
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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.
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02-11-2021, 10:20 PM | #16 |
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Re: Typical header dimensions
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
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02-12-2021, 07:42 AM | #17 | |
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Re: Typical header dimensions
Quote:
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02-13-2021, 01:03 PM | #19 |
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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 |
02-13-2021, 06:32 PM | #20 |
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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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