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S&S 640 Cam Kit For Harley Twin Cam 1999-2006
  • S&S 640 Cam Kit For Harley Twin Cam 1999-2006 - Gear Drive Cams

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Video Reviews (2)

S&S 640 Cam Kit For Harley Twin Cam 1999-2006 Videos

This product is legal in California only for racing vehicles which may never be used, registered or licensed for use upon a highway.

S&S Cycle 640 Camshaft Kit For Harley Twin Cam

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.


  • Only available in gear drive version
  • Gear drive cams include 4-gear set and installation kit
  • Made in the USA

640 Cam Info:

  • Designed for S&S T124 engines - This cam makes horsepower!
  • Intended for 95"-110" engines with compression ratios between 10.5:1 and 11.5:1
  • Strongest from 3000 RPM-6000 RPM
  • Comparable to Screamin' Eagle SE-264 and Andrews 59H cams
  • High-lift valve springs required for all applications
  • Intake open/close 25°/60°
  • Exhaust open/close 65°/25°
  • Intake duration 265°
  • Exhaust duration 270°
  • Lift .640"

Fitment Notes & Exceptions

  • Installer must check for coil bind, valve-to-valve clearance, and valve-to-piston clearance
  • Cam bearings and gaskets must be replaced when installing new cams
  • Due to inherent characteristics of gear-driven cams, you may experience greater valve train noise
  • For installation of chain-drive kit on 1999 Twin Cam motors, you must purchase a splined outer drive sprocket
  • High-lift valve springs are required to run these cams in all models
This Product Fits:
Harley Davidson
Dyna Convertible FXDS 1999, 2000
Dyna Low Rider FXDL/I 19992005
Dyna Super Glide FXD/I 19992005
Dyna Super Glide Sport FXDX 19992005
Dyna Super Glide Sport Touring FXDXT 2001, 2002, 2003
Dyna Wide Glide FXDWG/I 19992005
Electra Glide Classic FLHTC/I 19992006
Electra Glide Standard FLHT/I 19992006
Electra Glide Ultra Classic FLHTCU/I 19992006
Fat Boy FLSTF/I 20002006
Heritage Softail Classic FLSTC/I 20002006
Heritage Softail FLST/I 2006
Heritage Springer FLSTS/I 2000, 2001, 2002, 2003
Night Train FXSTB/I 20002006
Road Glide FLTR/I 19992006
Road King Classic FLHRC/I 19992006
Road King Custom FLHRS/I 19992006
Road King FLHR/I 19992006
Softail Custom/Nostalgia/Special/Deluxe FLSTN/I 2005, 2006
Softail Deuce FXSTD/I 20002006
Softail Springer Classic FLSTSC/I 2005, 2006
Softail Standard FXST/I 20002006
Springer Softail FXSTS/I 20002006
Street Glide FLHX/I 2006
Super Glide Custom FXDC/I 2005
Product Style RevZilla Item # Manufacturer Product # Availability
Gear Drive Cams 959696 33-5181 In Stock: Ships next business day


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S&S 640 Cam Kit For Harley Twin Cam 1999-2006
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