This listing is for a set of (8) power forged pistons and matching moly ring set compatible with 1972-90 Ford Mercury 460 V-8 engines. Available in your choice of sizes. Sizes shown are only sizes available! Pistons feature dish top coated skirts, 1.756" compression distance, 3.850" stroke, 5/64, 5/64 ,3/16 ring gaps. Press in style 1.040" pins included. For use with 6.605" rod length.