NEW IN BOX GRANT CAST ALUMINUM PISTONS FOR FORD 351W (WINDSOR) (5.8L). FITS 1977-1993. BORE SIZE (4.00"+.020").020" OVERSIZED. RECESSED HEAD (0.140") WITH 2 VALVE RELIEF. COMPRESSION HEIGHT 1.752" . COMP. RATIO 8.1:1 . RING SIZE 5/64 5/64 3/16. PIN DIAMETER 0.912" .YOU ARE BIDDING ON ONE SET OF 8 PISTONS AND 8 PRESS FIT PINS. THESE PISTONS ARE NEW FROM GRANT IN A GRANT BOX. GRANT #12747 , FEDERAL MOGUL # 463P , BADGER # 747. PLEASE DO YOUR RESEARCH BEFORE BIDDING. BE SURE WHAT YOU ARE BIDDING ON IS WHAT YOU NEED. WILL SHIP WHEN PAYMENT CLEARS. HAPPY BIDDING.