Quote:
Originally Posted by West Coast GTO
The plugs installed ate Champions RC12YC . I have no problem going with the NGK plugs but wonder what heat range I would need. The plugs that were in the engine were way wrong with the shallow thread( 1/2"-5/8") and the electrode was buried inside the head. The Champions at least extend into the chamber and are clocked correctly . I also have the complete MSD kit for changing distributor advance springs / stops and lockout.
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Get those out of your engine. I had one of those exact plugs come apart in my bracket 455. It was all loose, in half basically but still in one piece.
I did not learn my lesson and put in some more just because I had them. Another broke in the middle of the welded electrode and went through the engine or got blown out. Porcelain was gone and the bottom half of the electrode as well.
Engine did not get hurt it seems, ran its best ever time after I put some Accel plugs in it and never looked back.
Heads have not been off the engine since. It will be an interesting tear down.