I would think, disabling a spark to each cylinder and NO change, would rule out a Wrist Pin. But I think its a Wrist Pin.
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1968 Firebird 400 RAII M21, 3.31 12 bolt, Mayfair Maize.
1977 Trans Am W72 400, TH350, 3.23 T Top
Everyone you will ever meet knows something you don't.
Bill Nye.
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