Top End Kits

4" bore bolt-on cylinder and piston kit. 10.5:1 compression. Silver and black available. S&S 585 Easy Start Cams in either gear or chain version. TC3 Oil Pump.. TC3 Cam Plate. S&S cam chain tensioners or outer cam drive gears depending on selection...

The S&S M8 Power Package is the ideal combination of performance and savings, designed to transform your M8 without breaking the bank. For the latest generation H-D's, S&S is packaging their 124" bolt-in big bore kit with a 550 cam, cam plate and high...

The S&S M8 Power Package is the ideal combination of performance and savings, designed to transform your M8 without breaking the bank. For the latest generation H-D's, S&S is packaging their 124" bolt-in big bore kit with a 550 cam, cam plate and high...

The S&S 131" Big Bore Kits for M8 offer a huge displacement increase which in turn produces a huge power increase. Works with stock crankcases and retains stock engine height. Includes 131" cam cover badge and original engine serial numbers remain intact...

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...