• Next step up from the Torkstar 577 — more lift, broader displacement range, higher performance ceiling
• .615 lift — significant airflow gains over stock and mild performance cams
• Broad displacement compatibility — scales well from street builds to serious big-bore combinations
• Chain-drive design — fits 2007-and-up Twin Cam engines
• Compatible with 103, 107, 110, 113, and 117 cubic inch piston kit builds

• Lift: .615"
• IVC: 38°, 235 x 255 duration
• TDC Lift: .171 x .186
• RPM Range: 2,500 - 5,500 RPM

• Very reliable performance with excellent rideability
• Great low to mid-range RPM, torque and horsepower
• Sounds like a true Harley should
• Best For: Street & Mid-range performance

TC 103 - 117 cubic inch engines
Years: 2007+
Valve Springs: TC20-20350 recommended
Lifter Guides: Stock

Spring verification required — existing valve springs must be rated to handle up to .620 lift before installation. Upgrade springs if current springs do not meet this requirement. Star recommends TC20-20350.

Push Rods and Lifters can be stock.

Exhaust pairing matters: Star Cams will perform with all pipe configurations, but exhaust selection has a meaningful impact on results. Short exhaust systems create sound wave differentials that negatively affect low-RPM tune quality — a condition that cannot be fully corrected through tuning alone. For the smoothest low-end torque curve, a long 2-into-1 exhaust is strongly recommended. Trusted options include D&D, Fuel Moto, Bassani, ThunderHeader, and Krome Werks.

Professional tuning recommended for best results.