Redesigned S&S 4” Big Bore Kit
Viola, Wisconsin based ‘Proven Performance’ specialist S&S Cycle has updated its 100”/110” big bore kit. In fact, it has undergone a “total redesign,” according to S&S marketing lead David Zemla.
“It is better than ever,” he says, citing new materials and a return to the drawing board to create a “unique formula of ductile iron that decreases wear characteristics and allows us to increase contact between liner and fins for better heat transfer.”
Inspired by their pro stock drag race engines, the updated big bore kit utilizes a ductile cast iron liner wrapped in cast aluminum for optimum thermal conductivity and performance. 1999-2006 Twin Cam 88 engines roll up to 100ci, and 2007-17 Dyna/Softail and 2007-16 Touring become 110ci monsters!”
No machining is necessary, and install can be done with the engine still in the bike. S&S VP of Engineering Peter Winnie says the kit works well with stock cylinder heads, or S&S can CNC-port those heads “for even more power. At 10.5:1 compression it makes for a very streetable and dependable engine that also responds well to performance cams.” Available only within the USA at this time.
S&S CYCLE INC.