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These trucks have two problems with the plugs, either the threads in the head strip( they are real short) or the plugs also will snap off in the head, leaving the threaded portion of the plug in there.
Snap on makes a kit to remedy both of these scenario's. If the plug is just broken off in the head, the head does not need to come off. I have done this repair before.
I was lucky in that the one I had come in with stripped threads, was in for a head gasket, and I had to pull the head off anyway, I have never timecerted one of these heads before , but I am pretty sure the head does need to come off for this operation. Pretty lousy design if you ask me. I have also had to junk a set of heads as the cam bearing surface was completely torn up.
I think there replacement heads with the "PI" designation on them. They are called performance improved, but the spark plug holes are threaded all the way down to remedy thread stripping syndrome.
My butt cheeks pucker up real tight everytime I have to tune one of these up, as it is pretty hard to tell a customer that his tune up is going to cost $1500.00
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No left turn un stoned
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