For budget or stock-style rebuilds, it's hard to beat the value of Sealed Power cast pistons. They are made from high-quality aluminum alloys and feature a carefully controlled casting, heat-treating, and CNC-machining process. And, because they're designed and manufactured to exceed OEM specs, they'll provide improved reliability, performance, and a long service life. (1975-1987) GM, Chevy Truck, Buick, Oldsmobile, Pontiac 3.8L 231 V6 Engine. Bore 3.800, rings 5/64-3/16, Pin Dia .9397. Recessed Head 8.0:1 compression Ratio
