Enginetech P5036(8)STD PISTON GM CHEV 4.8L 5.3L FLAT TOPOur compression rings are made from the highest quality gray iron, ductile iron and high strength steel.Barrel face, taper face, positive twist, reverse twist and Napier face designs among others are used where required.Numerous ring face coatings are available depending on the application. As with every Enginetech part sold, our components meet or exceed O.E. specifications! Whether it is import or domestic, we have you covered!