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2Ner..... ...your #2 sparkie is kinda off-set over the exhaust valve. And as the valve lifts it is contacting your sparkie sidelobe and closing it down. Several things could be happening here. 1) exhaust valve is NOT adjusted correctly Check compression. Iff less than 90psi you may have burned your valve. The exhaust valve keeper could have come loose and the valve is bouncing up against the sparkie. Compression may or may not identify that problem. A visusal check of the valve operation by removeing the side-of-block valve cover will probably show you that problem. 2) you could have a carbon deposit on top of your valve and that is beating your sparkie closed. Usually the carbon will flake off after a little beating, so that problem is not a high possiblity. 3) the use of some EXTENDED NOSE sparkplugs will gett beat by the valve opening. What sparkplug are you using??? 4) sometimes the cylinderhead has been milled too much during an overhaul and you've lost the very slight clearance over the valve and the valve is beating yer sparkie. 5) yeah, your piston top could be hitting the top of your milled cylinder head, but I doubt it 'cuz ittabee goin' clackty-clack. But your piston is definately NOT pounding on your sparkie. Me? Iff'n the compression tested good, in the 120psi ballpark of the other cylinders. And iff'n I wanted to use extended tip sparkies, I'd probably just use the extender. It's a Ford approved device p/n 2N-12426, extender. Most of the guys find the AutoLite AL-437 to be the best sparkie..... ...Dell, the self-appointed sparkie-meister
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