BBC headers 3"to 2 1/4" too small? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

sir_talk_alot · 11-05-2012, 06:19 PM

ive got a 454 im fixing to build, and wanted opinions. ive got a set of headers that are 2" at the heads, with a 3" collector. ive got a brandnew set of flowmaster 40s that are 2 1/4 in in and out, are these too small to use? i thought about running 3in pipe back under it and then reducing down to the mufflers. think this would restrict much or hurt power? thanks

67ss&99ss · 11-05-2012, 08:08 PM

Yea, I would try to run 2.5" at least. They might be able to swell the inlets on them to that.

ulakovic22 · 11-06-2012, 10:26 AM

Quote:

Originally Posted by 67ss&99ss

Yea, I would try to run 2.5" at least. They might be able to swell the inlets on them to that.

^^^this. Swell the inlets to 2.5" on the mufflers and use reducers to take the 3" collectors to 2.5"

11-05-2012, 06:19 PM	#1
sir_talk_alot Registered User Join Date: May 2011 Location: Mayflower,AR Posts: 802	BBC headers 3"to 2 1/4" too small? ive got a 454 im fixing to build, and wanted opinions. ive got a set of headers that are 2" at the heads, with a 3" collector. ive got a brandnew set of flowmaster 40s that are 2 1/4 in in and out, are these too small to use? i thought about running 3in pipe back under it and then reducing down to the mufflers. think this would restrict much or hurt power? thanks __________________ -Mike- '94 GMT 400 ext z71 3" body, 3 in rough country, hd mirrors, 20" motometals on 35s

11-05-2012, 08:08 PM	#2
67ss&99ss Andy Join Date: Feb 2009 Location: Cleveland, GA Posts: 225	Re: BBC headers 3"to 2 1/4" too small? Yea, I would try to run 2.5" at least. They might be able to swell the inlets on them to that. __________________ 1967 Camaro SS 406\|522hp/514ft lbs\|M20 Muncie\|3.73s\|Posi 1969 CST/10 383\|Aisin AR5 5 speed 1972 K5 350\|Turbo 350 4x4 2005 Duramax 2500HD 4x4



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