I wonder if a valve/guide was too tight and stayed OPEN! Ask him to show you the disclaimer in his "warranty" about using gasoline thats better than it needs to be.
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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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