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ONE PAIR OF ORIGINAL BIG BLOCK RECT. PORT ALUMINUM HEADS. CLOSED CHAMBER L88, L89 427 CORVETTE. GM WINTERS CASTING 3904392. DATED 2-3-67 2-6-67. SOME REPAIRS AROUND A COUPLE MOUNTING HOLES AND HELICOILS. VERY COMMON FOR THESE HEADS. TAKEN OFF RUNNING MOTOR WITHIN THE LAST YEAR.CHEVELLE, CAMARO, CORVETTE, 396, 427, 454. CALLS ONLY. 610-390-five two one five.