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Mine is even higher and the TTI headders still fit,but mine is manual steering and 440.

A longer duration on the intake side with a later closeing intake valve might bleed off enough compression to run without pinging. The overlap happens at the end of exhaust/begining of intake cycle and actually raises the compression at some point in the RPM range. I run 10.5-10.65 to 1 on 93...

Thats more compression,more valve,more cam,more carband better intake than my current combo. I run an automatic with 4.30 gear and 29 inch slick.at 600 feet above sea level I have run 11.66. Ran 11.72 in 89 degree heat last week. I also have a 3/8 fuel line. I think you might be surprised the...