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Old 03-24-2009, 06:05 PM   #1
69heavychevy
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Join Date: Jan 2007
Location: Garland,TX
Posts: 431
having hard time with the thumper cam

i was wondering if anyone here was running a thumper cam, #12-600-4 to be exact. i just got thorugh installing one in my truck but having trouble with the timing. i seem to have to retarded quite a bit to get it to even run right. if anyone is running this came what do they have their timing set to. im also open to any suggestions. oh yea i have a performer rpm, edelbrock 600cfm, headers, and 993 heads. thanks in advanced!
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