Top End Kits

These S&S Big Bore Kits are available for both 107 and 114" M8 models. Available in both highlighted and non-highlighted versions. Wrinkle black and black granite finish. Bolt-on kit. Largest bore possible without machining required. Includes gaskets and...

Cylinder and piston kits make going to the maximum bore size easy, no machining required. Largest bore, 3.937", that can be fit in a stock engine case. Stock engine height is maintained. 11-fin cylinder design closely resembles O.E.M. shape and comes...

Piston weight for 106" kits are the same as stock, requiring no flywheel rebalancing. Cylinders do not require crankcase machining to install. Forged coated pistons are compatible with stock or S&S Super Stock heads. Valve pocket recessed in S&S pistons...

Forged pistons: coated piston skirts with measurement window and S&S logo. Stock 1200cc cylinders can be bored over to accept these pistons. Pistons have larger than stock valve pockets: accepts up to 2.00" valves. Made in USA. S&S 1250cc pistons with...

These S&S Big Bore Kits are available for both 107 and 114" M8 models. Available in both highlighted and non-highlighted versions. Wrinkle black and black granite finish. Bolt-on kit. Largest bore possible without machining required. Includes gaskets and...