Yosemitesam
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1990 Chevy Silverado/Cheyenne 350 block with peanut plugs.Spark plug holes where do the threads start to screw in the peanut plugs.Or do the threads start at the top of the spark plug hole if not at the top.How far/deep in do the threads start threaded part of the engine head.Broken off spark plug need to use an easy out to remove the the broken off threaded area/part of this spark plug.Need to know where the threads start in the spark plug hole to try to avoid breaking/snapping off easy out.