Performance Engine Kits

Harley Performance Valve Spring Kit 18344-05 This straight coil double spring Race Valve Spring Kit will allow the engine to rev to 7000 RPM and enable the use of higher lift cams. Springs fit with current XL and Twin Cam 7mm production valves. Complete...

Harley Screamin' Eagle Twin Cam 25482-10 Developed specifically for throttle body EFI systems, this cam has a modern lobe design that allows for higher valve lifts for a given duration Works great with 103 cubic inch and larger engines with free-flowing...

Harley Screamin' Eagle Automatic Compression Release Wiring Harness 70623-11 For use with Automatic Compression Release valves. NOTE: Please check fitment before purchasing. If in doubt, reach out to our team.  We will be glad to help. Discover a...