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Click on image for the lowdown. 
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10 members (DaveV, Joe H, Oswald, Phak1, GA Boy, 55shaker, Jay R, 32vsnake, Goach2, Ridgeback),
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guests, and
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robots. | | Key: Admin,
Global Mod,
Mod | | | Forums66 Topics128,198 Posts1,057,270 Members48,466 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: May 2005 Posts: 487 'Bolter | | 'Bolter Joined: May 2005 Posts: 487 | I had reasonably good results with exhaust mods. I had a stock 55.1 235, 81 RWHP. I changed to a Corvette exhaust manifold & twin 22" Smithy's mufflers, 87 RWHP. About a 7% improvement. Dyno Results regards, Leon
Last edited by Leon; 01/16/2012 5:47 PM. Reason: add inch sign behind 22
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