I agree the tri y headers are more than likely hurting you. Alot of people over look that part of a combination. I run 2 1/8" primarys to a 4" collector. But that is whats fun about working and racing there is always something new to try to get a little bit more out of the combination.
i'll bet that hauls butt! i run a 15/8 that steps to 13/4 with a 31/2 collector on my 331, it runs 10.94 @ 122. my cam was like yours with a 106 lobe angle, i race @ 3,000 ft. elevaton. also my ride picked up a lot uncorked. your car is way cool. talk to you later, jim
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