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. Ford/Mercury Marine 351(1977-1989). Bore (in): 4.000 in Bore (mm): 101.600mm Piston Style: Dish, with two valve reliefs Piston Material: Cast aluminum Wrist Pin Style: Press-fit Pin Diameter (in): 0.912 in. Piston Ring Thickness: 5/64 in. x 5/64 in. x 3/16 in.
