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2" vs. 1 7/8" headers for 427???

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Old Oct 25, 2007 | 09:42 AM
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Default 2" vs. 1 7/8" headers for 427???

due to the recent abundance of 2" headers in this section (yes, i consider two to be an abundance because that's more than twice as many as before...2>2x0) i was wondering how much improvement a 2" header would be over a 1 7/8" header on a 427.

intake specs:
vengeance ported fast 90/90 (NW tb)
AFR 225's
243/249 .629/.629 112+2 custom grind cam

rest of the exhaust:
3" or 3 1/2" piping (depending on header size, actually)
metal matrix cats
x-pipe
doug's cutouts (i think paying $600 for cutout is AWESOME lol...SYKE!! )
magnaflow straight-thrus
over the 12-bolt and out the back door

...

whadaya think??? worth the extra coin? or stick to the 1 7/8"???
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Old Oct 25, 2007 | 09:57 AM
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You may see a couple up top if you are talking straight N/A.

If you spray a healthy shot and that amount of increase has the potential to increase more.

IMO, would not be worth the extra $$$$. You may see things differently..
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Old Oct 25, 2007 | 10:24 AM
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yeah, straight N/A for now...i'm gonna end up ditching the headers when i get turbos later on. yet, ironically, i will be putting a modest shot ontop of the that lol
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Old Oct 25, 2007 | 11:08 AM
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SS101, I know I asked you to call me on another thread but looking at your specs here I'd say 1-7/8" headers are all you need. If you have any other questions feel free to call me. 631-608-1986.

Nick
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Old Oct 25, 2007 | 03:03 PM
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Default kooks recomadation

With your cam specs and lobe sep. I would suggest our 1 7/8 stepped to 2" header. Katech and gm performance have seen great gains with this header on there 427 packages with similar modifacations.
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Old Oct 25, 2007 | 08:36 PM
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Originally Posted by GeorgeR@kooks
With your cam specs and lobe sep. I would suggest our 1 7/8 stepped to 2" header. Katech and gm performance have seen great gains with this header on there 427 packages with similar modifacations.
i second what he said
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