Silv-O-Lite Pistons for 1968-73 Chevy 307 5.0L V8 Oversize 30Flat Top Piston, Four valve reliefBore Size: 3.905 / 99.187mmCompression Height: 1.655Pin Diameter: 0.927Piston Ring Thickness: 5/64 x 5/64 x 3/16Set of 8