S&S 640 Cam For Harley Big Twin Evo 1984-1999

S&S Cycle 640 Camshaft For Harley Big Twin Evo

S&S has been in the business of making Harley-Davidson motorcycles go fast for a very long time, and their innovation in the world of bumpsticks is not exactly a secret. If you’re looking for more power from your bike, a cam is a wonderful place to start – especially if you’ve already done most of the easy ‘bolt-on’ modifications. Installing an S&S cam is a surefire way to make your mill suit your riding style while getting maximum output.

Features:

• S&S cams are tested on the dyno, street and track before being offered to the public
• With hundreds of hours of testing on each cam, you know you are getting the best cam S&S can produce
• Made in the USA

640 Cam Info:

• Designed for large-displacement engines (110″) with 10.5:1-11.5:1 compression ratio or smaller engines (96″-107″) with 11:1-12:1 compression ratio
• 3000 RPM-6000 RPM
• Does not require as much compression as 631 cam and provides more linear power delivery
• Less overlap and fast ramps build higher cylinder pressure
• Lower TDC lift makes installation easier
• Intake open/close 25°/60°
• Exhaust open/close 65°/20°
• Intake duration 265°
• Exhaust duration 265°
• Lift .640″