Originally Posted By burdar
Blocking the air ports in the heads is a piece of cake. Just tap the holes and plug with set screws.


Just don't be in too big a hurry to tap the heads, because taps are brittle and if you break it off in the hole they are not easy to remove whiney

I know where a pair of rebuilt 1990 360 truck heads are in Tacoma that have 7 of those holes plugged and 1 with a broken tap still there. They are not mine...now. But could be yours if you want to do some trading.

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