Re: Engine Problem
I believe the "J" series threads are ok for clearance...actually a bit shorter than the correct H10 Champion threads...BUT the "Y" suffix means extended tip and that may be a problem as the valve opens enough to hit.
Are the Autolite 216's being hit as well? They should be ok with a stock head unless the cam has a LOT of lift.
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"It don't take but country smarts to solve the problem" (Smokey Yunick)
'41 Merc Town Sedan / 260" 8CM engine
'66 Fairlane four door / "warmed up"  302
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