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. (1971-1982) Ford, Ford Truck, Mercury 400 CI 6.6L V8 Cast Piston. Bore 4.000, rings 5/64-3/16, Pin Dia .9751. Recessed Head w/2 valve reliefs. Compression Ration 7.9:1
