TEXASS Posted April 5, 2007 Report Share Posted April 5, 2007 put a new motor in the truck about almost a month ago, have a holley 770, i'v went through 2 power valves since. need awnsers soon people next door dont like hearing a boom at 6am Quote Link to comment Share on other sites More sharing options...
Dave1647545494 Posted April 5, 2007 Report Share Posted April 5, 2007 backfires blow power valves fix whatever is making the truck backfire and it won't blow anymore of them (timing or vacum leak or too much fuel) or switch to carb like a carter/edelbrock or q-jet that doesn't use them Quote Link to comment Share on other sites More sharing options...
Guest Removed Posted April 5, 2007 Report Share Posted April 5, 2007 newer holleys have a power valve saver...sounds like you have a valve too tight. or the timing is off. Quote Link to comment Share on other sites More sharing options...
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