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post #6 of (permalink) Old 01-10-2002, 05:29 PM
**DONOTDELETE**
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Re: Holley Jetting? + fuel pressure?

OK I fixed the vacuum leak today and have about 14" of vacuum at 650 RPM's. I am running 63 jets and a 4.5 power valve. Timing is set to 8* with the chevy HEI set up and I am running a Cliffor 264 duration cam. I am getting a backfire through the carb when I stomp on the go fast pedal, but if I accelerate like a normal person (read slowly) then there is no backfiring at all. Also my vacuum will drop to almost 3" when accelerated hard, but will jump to the end of the scale after that. I am also running my fuel pressure at 5.5 now. Thanks for all your help.

Jon
84 Toy,72 CJ5,91 RM125
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