Quote:
Originally Posted by gtofreek
Bad gas will glue up the intake valve stems in the guides which would make the valve close too slow, which would exactly explain why the engine runs like it does and why the knock is there. To me the knock sounds like a roller lifter smacking the cam lobe because of lash being present, which would happen if the valve is getting stuck in the guide.
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How long does it take for that to happen? The bad gas sticking a valve.
Carb got primed, the engine fired right off and the TAP TAP TAP was there.
That would mean bad gas sets up faster than super glue OR if it is valve related...something was wrong prior to delivery. Like a stuck plunger in the lifter or trash in the check valve. Or maybe the dyno gas was bad?
Clay