S&S CYCLE Cylinders - 4.125" - Black 910-0401 Tires Crankcases must be bored to

Crankcases must be bored to accept the larger 3-5/8" cylinders and stock flywheel assembly should be rebalanced

Big-bore bolt-on kit increases 114"/117" with 4-1/2" stroke M-Eight to 128" with no case machining required

Improved horsepower and torque (when used with a Stealth Air cleaner kit

or to replace the cylinders and piston in an engine with an existing S&S stock bore stroker kit

S&S CYCLE Cylinders - 4.125" - Black 910-0401 Tires Crankcases must be bored toCylinders 4. 125" Black Cylinders have a stock bolt pattern, Bored slightly under nominal size and are not honed, Designed for 124" Hot Set Up Kits used in '99 '17 Twin Cams, Wrinkle black finish with machined edges, Made in the U. S. A., Requires crankcase machining.