At cranking speeds, the lobe bumps the exhaust valve open slightly during the compression stroke, making the engine much easier to turn over.Once the engine fires and reaches 800 RPM, the lobe swings out of the tappet roller path, allowing the engine to run normally and with full compression.

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Quiet valvetrain with excellent low/mid range torque for touring and 2 up riding.510V: Bolt-in cam that works well with stock or ported heads.

Improved ramp design results in low valve train noise.

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

The most innovative S&S product since the electric compression release system, these cams will revolutionize the starting of late model big twins.

HP103: For the rider who really wants the most top end horsepower.

Easily make 100 horses from a stock engine with S&S intake and exhaust.

551 cams are not recommended for compression ratios of 10:1 or greater.

Greatly improves low-end and midrange torque, strongest from idle-4000rpm.

All reference to H-D® and Andrews® part numbers is for identification purposes only.