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. (1968-1973) Ford, Ford Truck 429 CI 7.0L V8 Cast Replacement Piston. bore 4.362, Rings 5/64-3/16. Pin Dia 1.0402. 8.0:1 Compression ratio. Oblong Recessed Head w/2 valve reliefs.