Ford Mercury 460 Speed Pro Hypereutectic Coated Skirt Flat Top 2VR Piston Set/8 with Matching Rings (.4.400 bore) CLICK ON BOX FOR OVER SIZE NEEDED BEFORE ADDING TO CART Flat head w/2-valve reliefs. DurOshield skirt coated piston. 5/64" 5/64" 3/16" ring grooves 1.040" pin diameter - pins included For stock 6.605" length rods Press-fit only Stock 3.850" stroke Compression distance: 1.752" Piston head volume: -4.2cc Approx. Compression (w/.030" bore): w/72.0cc chambers 10.81:1 w/77.0cc 10.33:1 w/97.0cc 8.81:1 1972-90 (late model heads are 92-97cc