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Old 06-20-2002, 02:39 PM
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Post BBC in a 68 short bed step side chevy

Hello all. I need to know what kind of compression i can run with iron heads and pump gas on a big block chevy. It's a 454 that is .040 over. Thats as far as i've gotten. Still undecided on pistons rods and crank. Any suggestions? Thanks,
79 monte

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Old 06-20-2002, 04:34 PM
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Thats a question that always gets a lot of different answers. Ive always been told that 10-1 is about as hi as you should try without having problems, but some say 10.5-1, 9.5-1, its always different.
I had a sbc that I ran 10.25-1 and with 94 octane it ran OK, but with much under 90 octane would just start to ping when pushed hard.
With alluminum heads or a hi lift cam you can run the comp a little higher, but 10-1 is real close to the max on pump gas. HG
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