Quote:
Originally Posted by afterburn 549
I am voting a guide problem.
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I would have to agree. I have yet to go into a M8, but I highly doubt in stock form HD would have valve to piston clearance that close. Has to pass Fed smog. With that said, if it already has higher compression pistons in it, and of course a larger cam, it is possible with severe valve float, or a cam installed out of time.
Backfires don't cause bent valves. Contact does. If they were trying to tune it for more HP, and it went very lean, it will easily stick a guide or tulip a valve. Ask if the pushrod was damaged.
