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Re: Exhaust help
2.5" will be fine with stock cam. When I had my '70 with the 402 I was planning on a dual 2.5" into a single 3" RV muffler. It had a crower 270 cam but still had stock manifolds. Killer flow and low sound level with the two into 1. If you go with two mufflers, I'm a big fan of the Walker Hemi Turbos.
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44 Willys MB
52 M38A1
64 Corvette Coupe
68 Camaro 'vert LT1 & TH700
69 Z/28 355 12.6's @110
69 Chevy Short Step 4 1/2"/7" drop
72 Jimmy 4WD 4spd 4" & 35's
02 GMC 2500HD 4x4 Duramax
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