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. GM Pontiac 389 V8 (1959-1966) GM 4 Cyl 195 1961-1963. Flat Top Piston w/4 valve reliefs. 4.0625 Bore, Rings 5/64, 3/16, .9804 Pin Dia
