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Discussion Starter #1
Have this problem that I've been trying to figure out. When I rev the motor it backfires when its coming down. Dont know if this is a bad lifter or bad lobe on the cam. hyd flat tappet Any help would be appreciated
 

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Is it a loud backfire or kinda like a rumble.My old motor had a header leak and it would rumble every time I would rev it.
 

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Discussion Starter #5
one big pop follwed by 2 smaller pops as its revs down. Has big jets plugs look good. it has a little header leak but it was doing this when they were new
 

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Lean pop on deceleration sounds like
 
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