2102cc kit. Converts the 107" engine to 129". Largest possible 4.320" bore bolt-in big bore kit. Stroker flywheels not required. Works with stock crankcases; case boring is not required; stock flywheels; stock heads and retains stock engine height. Kit includes a forged 4.320" big bore piston kit; black wrinkle powder coated 4.320" big bore cylinders; 2 MLS (Multi-Layer-Steel) .030" head gaskets; 2 cylinder base gaskets; 4 cylinder dowels and an S&S cubic inch cam cover batch. Black powder coated finish to match OEM finish. Note: For the 132" kit (to convert 114" engines) S&S measured 135.51HP and 145.83TQ with stock heads; a 550 cam; stock throttle body and a high flow Stealth air cleaner kit. Note: Tuning of fuel injection and ignition may be required. Note: S&S advises 576972 S&S head bolt kit for all big bore applications.