216 vacum leak
Check for a crack along the casting flash of the intake manifold. Very hard to see but gets a lot bigger with any backfiring. They crack easily when warped. also I was told to double up on the intake gasket. Also check carefully that the intake rings sit completly into the steped grooves and there is no carbon or rust getting in the way. check the grooves on both head and manifold. and oh yea look for a cracked vacum fitting to the windshield wipers. how do I know these things??? The hard way as usual.
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