Because they are designed and manufactured to exceed O.E.M. specifications, these pistons provide improved reliability, performance, and a long service life. This item is for eight (8). 030-in. over bore Sealed Power cast aluminum flat top with 4-valve reliefs pistons and a cast piston ring set (Hastings/MAHLE) for 1962-1969 Chevrolet 327ci small block V-8 engines; except special H/P engines.