S&S 640GE Gear Drive Easy Start Cams greatly improves valve timing accuracy by eliminating timing chain lash and allow stock starter to start any engine. The 640 cam is designed for engines of 95 inch or more with compression ratios between 10.5:1 and 11.5:1 used in S&S 124 inch engines.
Cam kit includes inner gears as well as an outer cam drive gear kit. Fits 1999-2006 Harley-Davidson® big twin (except 2006 Dyna®).
Note: These cams are not bolt in and will need special valve springs.
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