I picked up at least 2 tenths by changing to 3 inch exhaust than 2 1/2 from the mufflers than to the tail pipes which were 2 1/2 then I switched out the tail pipes to 3 inch and picked up another 1 tenth.
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74 Formula
469, 6X-4's, 72 Intake, Ramair Manifolds.
3 inch exhaust with x-pipe
Custom Roller Cam, 1.52 Roller Rockers
Quadrajet done by Cliff
3:42 gears
12.075 @ 112.70
12.092 @ 112.43
12.128 @ 111.71
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