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

$242.20
$254.95
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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 Cam For Harley Big Twin Evo 1984-1999 Resources

S&S 640 Cam For Harley Big Twin Evo

Features:

  • For large displacement motors with compression ratios of 10.5-11.5:1
  • Can be used in smaller motors with 11:1-12:1 compression ratio
  • The S&S 640 cam features the latest design in controlled ramps and is intended for hydraulic lifters
  • With lower TDC lifts and faster ramps than the S&S 631 cam, the 640 cam builds higher cylinder pressure
  • Therefore it does not require as much compression as the 631

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"
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This product is vehicle specific. Click here to select your vehicle to ensure fitment.

Fitment Notes & Exceptions
  • Installer must check for coil bind, valve-to-valve clearance, valve-to-piston clearance, and cam lobe to case clearance
  • Cam bearings and gaskets must be replaced when installing new cams
  • Works with hydraulic lifters
  • High-lift valve springs are required to run this cam in all models

This Product Fits:


Harley Davidson
Disc Glide FXRDG 1984
Dyna Convertible FXDS 1994, 1995, 1996, 1997, 1998
Dyna Glide Custom FXDC 1992
Dyna Glide Daytona FXDB-D 1992
Dyna Glide Sturgis FXDB-S 1991
Dyna Low Rider FXDL/I 1993-1998
Dyna Super Glide FXD/I 1995, 1996, 1997, 1998
Dyna Wide Glide FXDWG/I 1993-1998
Electra Glide Classic FLHTC/I 1984-1998
Electra Glide Special FLHX 1984
Electra Glide Sport FLHS 1984-1993
Electra Glide Standard FLHT/I 1984-1998
Electra Glide Ultra Classic FLHTCU/I 1989-1998
Fat Bob FXEF 1985
FLH 1984, 1985
Low Glide/Low Rider FXRS 1984-1993
Low Rider Chrome FXRC 1985, 1986, 1987, 1988
Low Rider Custom FXLR 1987-1994
Low Rider Sport FXRS-SP 1987-1993
Road Glide FLTR/I 1998
Road King Classic FLHRC/I 1998
Road King FLHR/I 1994, 1995, 1996, 1997, 1998
Softail Bad Boy Springer FXSTSB 1995, 1996, 1997
Softail Custom FXSTC/I 1986-1999
Softail Deuce FXSTD/I 1999
Softail Fat Boy FLSTF/I 1990-1999
Softail Heritage Classic FLSTC/I 1987-1999
Softail Heritage FLST/I 1986, 1987, 1988, 1989, 1990
Softail Heritage Springer FLSTS/I 1997, 1998, 1999
Softail Night Train FXSTB/I 1999
Softail Nostalgia FLSTN/I 1993
Softail Special FLSTN/I 1994, 1995, 1996
Softail Springer FXSTS/I 1988-1999
Softail Standard FXST/I 1984-1999
Sport Glide FXRT 1984-1992
Sport Glide Grand Touring FXRD 1986
Super Glide FXE 1984, 1985
Super Glide FXR 1994
Tour Glide Classic FLTC/I 1984-1991
Tour Glide FLT 1984, 1985, 1986
Tour Glide Ultra Classic FLTCU/I 1989-1996
Wide Glide FXWG 1984, 1985, 1986
Product Style Item # Store SKU Manufacturer Product # Availability
Product Style S&S Cycle 640 Cam For Harley Big Twin Evo 1984-1999 Item # 959720 Store SKU Manufacturer Product # 33-5108 Availability In Stock: Ships next business day
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