Those are good 1/4 times for the 2.56 gear. Must have quite the top end charge.
What cam with the hi compression iron head 455.
Run on is pretty common. The question for me is, does detonation occure before or after the normal idle ignition timing.
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Bull Nose Formula-461, 6x-4, Q-jet, HEI, TH400, 8.5 3.08, superslowjunk
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