3-5/8" bore cylinder and piston kit for modified 1984–'99 Harley-Davidson® Sportster® models or 1994–'02 Buell® models with 89" Sidewinder® kits and stock style cylinder heads. Forged pistons and S&S cylinders provide consistent performance and reliability. Stock crankcases must be machined to accommodate the larger spigot diameter. Valve pocket recesses in S&S pistons are enlarged for oversize valves and higher lift cams. Combustion chamber modifications must be made to stock cylinder heads to reduce compression. Choose finish.
Natural. . . . 91-3208
Black. . . . .91-3916
