03-25-2009, 09:39 PM
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Sierra Grande Club
Join Date: Jan 2007
Location: New Mexico USA
Posts: 2,433
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Re: 2 1/4" or 2 1/2" Dual Exhaust?
I'm running 2.5 on my 383 and its good to 400 hp on my sbc.
s/t
Here's where I got my bases for my size....
Quote:
Originally Posted by LUV2XCLR8
This is thread #1,000,000,000,000+ on Exhaust questions  and I'm not even
going to put my dog in this fight, however I always post this chart to helpout
others here, it is out of the Dealers Part book for Flowmaster products, cya 
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1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe. 
Last edited by Sport/Truck; 03-25-2009 at 09:52 PM.
Reason: Inserted quote from LUV2XCLR8
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