S&S, M8 132/136" big bore cylinder and piston kit. HC +8.5cc

High compression ratio.
Black cylinders without highlighted fins.
With piston crown +8.5cc.
Compression ratio 12.7:1 for 132" and 13.1:1 for 136" with standard 88cc heads.
Compression ratio 12.1:1 for 132" and 12.3:1 for 136" with 94cc SE Extreme Port cylinder heads.
Largest possible 4.320" direct bolt-on big bore kit.
132" (2162cc) is achieved when used with stock 114" flywheels.
136" (2222cc) is achieved when used with S&S 923270 4-5/8" stroke flywheels.
Compatible with stock crankcases, no case boring required, stock heads and retains engine height. The kit includes a forged 4.320" big bore piston, 4.320" big bore cylinders, 2 .040" MLS (Multi-Layer Steel) head gaskets, 2 cylinder base gaskets, 4 cylinder dowels, exhaust gaskets and an S&S cubic inch cam cover badge. Black powder-coated finish to match the OEM finish.
Note: For the 132" kit, S&S measured 135.51HP and 145.83 torque with stock cylinder heads, 550 camshaft, stock throttle body and high flow Stealth air cleaner kit.
Note: Fuel injection and ignition adjustment may be necessary.
Note: S&S recommends the S&S 576972 cylinder head bolt kit for all big bore applications.
Note: 136" is not compatible with OEM 4-5/8" stroke flywheels, you must use the S&S 923270 4-5/8" stroke flywheels.
Note: Not compatible with 107" engines (4.375" stroke).


Specifications


Brand
S&S


Application
17-25 114" M8 Models; 17-25 M8 models with S&S 923270 4-5/8" (4.625" ) stroker flywheels (excl. CVO) (NU)


Sales unit
Kit


Packaging weight
13.5 kg


HS Code
87141090


Motorcycle family
SOFTAIL, TOURING, TRIKE


Original name
S&S, M8 132/136" big bore cylinder & piston kit. HC +8.5cc