Silv-O-Lite Pistons for 1977-79 Oldsmobile 403 6.6L V8 Oversize 30Dish Piston, No valve reliefBore Size: 4.381 / 111.277mmCompression Height: 1.595Pin Diameter: 0.981Piston Ring Thickness: 5/64 x 5/64 x 3/160.146 Deep Head RecessSet of 8