Bought a Van......

318willrun said
Got all the rockers swapped out. Started it and let it idle, and as good as it ran before it seems even a little smooth and quiet (again, my ears are on high alert! LOL). I pulled a plug. As I thought, it had the iridium plugs in it, and black as coal as I suspected. Going to buy RC12YC's now. Solid copper core for me!!

THE TUNING CONTINUES..... (jabs?) LOL :D
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My comment on measuring the distance from the valve stem to the rocker arm stud is in relationship to had the guy drilled the heads for the bigger studs he might have drilled them off center of the original hole in the head. Thus moving the rocker arm forward or backward or sideways in relationship to the tip of the valve.