Regardless of displacement or compression ratio with a stock starter, Easy Start Cams from S&S® Cycle make hard starting obsolete for big twins. Available in chain drive and gear drive versions. Don't get caught "dead" without them! More Proven Performance® from S&S Cycle, Inc., the leader in V-Twin high performance parts since 1958.
The 640 cams are 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.
For technical camshaft information along with detailed product support, please visit our Performance Cams page.