The old test for a bad intake valve is to hold a piece of paper near the tail pipe and see if it sucks in. Could some bent or burnt valves cause the rust to get sucked in?
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Never time to do it right, always time to do it over.
Mearl
66 GTO 389 4 spd
76 T/A needs everything+
77 T/A original, needs restored
78 T/A WS6, SBC400, fun but needs work
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