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Re: Question on header diameters..
Wow mention of 1-1/2" headers, thats a small pipe not suitable for anything over 300 cu or with any modifications.
A stock/mild 267-305 will usually be fine with 1-5/8" headers, step up to a cam with over .400 lift and your going to want the 1-3/4" headers. A 327-400 will benifit most from 1-3/4" even stock smog engines. Usually 1-3/4" will flow well for an engine to the 400 hp range then you step upto the 1-7/8" might even want to go to the 2" or the 2-1/4" after that.
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1976 Custom Deluxe SWB Med FMB.3/4 Drop.
Gen VI 454, Muncie HD 3 speed With Modified OE Hurst Shifter, 3.73 12 bolt, GMPP HO roller cam, Hooker headers, Performer intake with modified Q-jet, Accel distributor. Best 1/4 12.3 @108. Funnest run 19.84 @88 full 1/4 mile burn out.
1997 K1500 ext cab 5.7 stock except muffler
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