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Click on image for the lowdown. 
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8 members (Rusty Heaps, Wickedbass, Gray_Ghost, cmayna, tclederman, Peggy M, TexasA&M48Truck, Wally / Montana),
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Mod | | | Forums66 Topics128,066 Posts1,055,876 Members48,428 | | 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!
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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
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#50472 09/23/2005 11:18 AM | Joined: Jul 2005 Posts: 71 Member | | Member Joined: Jul 2005 Posts: 71 | I need to replace the whole system on my 42 ccw (270). Originally 2.5" from manifold to muffler, then 2" outlet & tailpipe. Why the step-down in diameter?Is some back-pressure any advantage on this motor, or is 2.5" right through better? Opinions seem to vary. :confused: Thanks | | |
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