“Twin Cam Power. Cranked to the Max.”
At Cranky Chain Cycles, our Twin Cam performance engine kit upgrades are designed to wake up your Harley with stronger torque, sharper throttle response, and rock-solid reliability. We specialize in Twin Cam–specific big bore kits, high-compression pistons, performance camshafts, upgraded lifters, and precision oiling components that work together to push serious power while keeping heat and longevity in check. Whether you’re looking for a hard-pulling street build or a full Twin Cam powerhouse, every kit is carefully matched and installed with obsessive attention to detail. The result is a Twin Cam that hits harder, runs smoother, and delivers unmistakable Harley performance every time you roll on the throttle.
S&S CYCLE 100" Power Package Engine Performance Kit
- Made in the USA
- S&S 4.000" Big-Bore Cylinders, Piston Kits, S&S 585 Easy Start® Cams, S&S Quickee Pushrods, TC3 Cam Support Plate, TC3 Oil Pump, and Precision Hydraulic Tappets are included in this kit
- S&S Cylinder
- 2x S&S 4.000" bore cylinders
- Low friction ductile cast iron liner
- Bolt in
- No maching, balancing, or splitting the crankcase
- Can be used with stock heads
- Increase displacement from 88 ci to 100 ci
- Piston Kit
- 2x 4.000" pistons for front and rear
- 2x 0.927" piston pins
- 4x Piston pin clips with installation tool
- 2x Ring packs which includes the top, second, oil rail and expander rings
- Provides 10.5:1 compression ratio
- S&S 585 Easy Start® Cam Specifications
- Intake: Open 20° / Close 45° / Duration at 0.053" 245° / Valve Lift 0.585"
- Exhaust: Open 60° / Close 20° / Duration at 0.053" 260° / Valve Lift 0.585"
- S&S Quickee Pushrods
- Adjustable with chrome tubes
- TC3 Cam Support Plate and TC3 Oil Pump
- Machined from aluminum forgings
- Ensures consistent oil pressure and engine longevity
- Precision Hydraulic Tappets
- Close tolerances for low leak down rates
- Reduced valve train noise from start to shut down
- Notes
- Not for '06 Dyna.
- Not compatible with S&S 79 cc Super Stock® heads.
- Not recommended for Tri-Glide or other three wheel models due to lugging nature of these bikes.
- '99-'04 Twin Cams will require the additional purchase of valve spring kit (sold separately).
ZIPPER'S® MUSCLE 107
Looking for a Big Power Boost for your ’99-’06 Twin Cam? Zipper’s Muscle 107 kit will double the HP of a TC 88” engine – all while looking stock from the outside! A new 4-3/8” stroke crankshaft replaces the original 4” crank, while your cylinders are decked and precision fit with 3.937” 10.6:1 pistons. Your heads receive Zipper’s Stage III CNC porting with new guides, oversize valves, performance springs and manual compression releases. Our Red Shift 577 cams provide big torque & HP gains across the entire RPM range. Also included are Pro-Taper pushrods and EZ-Adjust covers, with all gaskets needed for assembly. Highly recommended option: Zipper’s #417-495 blueprinted cam chest upgrade with our Red Shift Dual Piston hydraulic cam chain tensioners, blueprinted billet plate, HV oil pump, cam bearings and quality USA lifters for improved reliability and durability. Amazing New Life for the 1st Generation Twin Cam® – M8’s BEWARE!
ZIPPER'S® MUSCLE 117
Take your 88” Twin Cam to 117” with Zipper’s Muscle 117 kit! A new 4-3/8” stroke crankshaft replaces the original 4” crank; new stress-relieved 4-1/8” bore cylinders are precision fit with forged pistons set for 10.6:1 compression. Your heads receive Zipper’s Stage III CNC porting with new guides, oversize valves, performance springs and manual compression releases. Our Red Shift 577 cams provide big torque & HP gains across the entire RPM range. Also included are Pro-Taper pushrods and EZ-Adjust covers, with all gaskets needed for assembly. Highly recommended option: our # 417-495 blueprinted cam chest upgrade with our Red Shift Dual Piston hydraulic cam chain tensioners, blueprinted billet plate, HV oil pump, cam bearings and quality USA lifters for improved reliability and durability. Case boring required, Timken recommended. Enjoy Big, Broad Power at every throttle position with the Muscle 117!
ZIPPER'S® MUSCLE 124
Zipper’s Muscle 124 kit delivers 140+ Twin Cam® HP & Torque! A new 4-5/8” stroke crankshaft replaces the original 4” crank; new stress-relieved 4-1/8” bore cylinders are precision fit with forged pistons set for 10.75:1 compression. Your heads receive Zipper’s Stage IV CNC porting with highly modified chambers, 2.0” intake, 1.630” exhaust valves, performance springs. Our Red Shift 657 cams provide stunning torque & HP gains across the entire RPM range. Also included are Pro-Taper pushrods and EZ-Adjust covers, with all gaskets needed for assembly. Highly recommended option: Zipper’s #417-495 blueprinted cam chest upgrade with our Red Shift Dual Piston hydraulic cam chain tensioners, blueprinted billet plate, HV oil pump, cam bearings and quality USA lifters for improved reliability and durability. Case boring, Timken conversion required. CVO? M8? Make them all believers with Zipper’s Muscle 124 Twin Cam®!