Fits 99-06 Big Twin models (exc 06 Dyna)
Gear drive

For 88"/95"/96"/103" cubic-inch engines. Compression ratios below 10:1. 99-04 models require high-lift springs.

Start any engine regardless of displacement or compression ratio with a stock starter

Save your starter and battery; tested for 10,000 starts without running battery down

Allow for easy start by initially reducing crank compression, but once the engine starts and rpm increases, the compression release lobe is centrifugally retracted and the engine runs normally, with full compression, and without any loss in performance

All chain-drive cams include installation kit

All gear-drive cams include 4-gear set and installation kit

For 88/95/96/103 cubic-inch engines

Compression ratios below 10:1

Installer must check coil bind, valve-to-valve clearance and valve-to-piston clearance.

Due to the inherent characteristics of gear drives, you may experience more valve train noise.

Not for models with OEM compression releases.

Made in the U.S.A.

GRIND - 570 SERIES
INTAKE LIFT AT TDC - 0.187"
INTAKE OPEN - 20°
INTAKE LOBE CENTERLINE - 100°
INTAKE CLOSE - 40°
INTAKE LIFT - 0.570"
INTAKE DURATION - 240°
EXHAUST LIFT - 0.570"
EXHAUST DURATION - 250°
EXHAUST LIFT AT TDC - 0.179"
EXHAUST OPEN - 55°
EXHAUST LOBE CENTERLINE - 107.5°
EXHAUST CLOSE - 20°