S&S, 114" TO 128" BIG BORE CONVERSION CYLINDER & PISTON KIT

S&S, 114" to 128" big bore conversion cylinder & piston kit

Complete bolt-on kit. Compatible with stock 114 engines, which have the required 4.5" stroke. Converts the 114" engine to 128". Incl. black wrinkle cylinders with highlighted fins and a forged 4.250" bore piston & ring kit with 1.0805” deck height and -7.2 cc dish volume for an 11:1 CR with stock cylinder head combustion chamber volume. Incl. all required head & base gaskets and hardware. Provides a massive increase in capacity with bolt-on installation ease, no case boring, head work or flywheel re-balancing required. Note: S&S advises 576972 S&S head bolt kit for all big bore applications.

Fits: > 17-21 114" M8