I had a similar problem on my 351. No smoke just greased spark plugs. The intake and heads (both alluminum) did so much "walking" during temperature changes that it ripped the intake gasket to shreds. No matter what gasket I tried it would still destroy them but I finally found one made by felpro that had a sheet metal core. Haven't had any problems yet, and my plugs are clean. Good luck.
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66 coupe: 351W 30 over. Fiberglass shelby parts + flares
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