This listing is for a set of eight (8) +.030" overbore Set of (8) cast aluminum pistons and a set of cast piston rings compatible with 1962-69 Chevrolet models with the 327ci small block V-8 engine. Piston specifications are as follows: HEAD TYPE: Flat head w/4-valve reliefs RING LANDS: 5/64"-5/64"-3/16" COMP. DISTANCE: 1.654" PIN DIAMETER: .9275" NOTES: 8.7:1 CR