S&S Cycle 84-99 BT 640 Camshaft

This 640 is for 1984-1999 Harley-Davidson® big twin models with large displacement motors with compression ratios of 10.5 - 11.5:1 or smaller motors with 11:1 - 12:1 compression ratio, does not require as much compression as the 631. For hydraulic tappet, spring spacing is required.

• This camshaft IS also for 1954-1984 big twins with either the Hydraulic Conversion kit or the Cylinder Head Replacement kit for panhead engines

The S&S Cycle SSC33-5108 Big Twin 640 Camshaft is designed to enhance performance on Harley-Davidson big twin models manufactured between 1984 and 1999. This camshaft is suitable for engines with large displacement motors featuring compression ratios of 10.5:1 to 11.5:1 or smaller motors with compression ratios from 11:1 to 12:1. It offers a balanced upgrade for riders seeking increased power and efficiency without requiring the high compression needed for other cam profiles. The camshaft is compatible with hydraulic tappet systems, necessitating spring spacing adjustments during installation. It is particularly suitable for models such as the 1990 Harley Davidson FLHS Electra Glide Sport, FLHTC Electra Glide Classic, FLHTCU Ultra Classic, and several Softail and Springer models from that era. This product is engineered to provide reliable performance and smooth operation, making it an ideal choice for enthusiasts aiming to improve their motorcycle's power output and overall ride quality. Please note that this camshaft is not carbureted-approved and requires carb acknowledgment during installation. Proper installation ensures optimal engine performance and longevity. Trust S&S Cycle's reputation for quality and innovation with this high-performance camshaft designed specifically for your Harley-Davidson big twin engine.

Features:

• Designed for Harley-Davidson big twin models from 1984 to 1999

• Suitable for engines with 10.5:1 to 11.5:1 compression ratios or smaller motors with 11:1 to 12:1 compression

• Compatible with hydraulic tappet systems, requires spring spacing adjustments

• Enhances engine performance and power output

• Engineered for reliable operation and smooth power delivery

• Fits multiple Harley-Davidson models including Softail, Heritage, and Electra Glide series

Fitment:
Harley Davidson FLHR Road King Base 1997
Harley Davidson FLHR Road King Base 1998
Harley Davidson FLHR Road King Base 1999
Harley Davidson FLHRCI Road King Classic Base 1998
Harley Davidson FLHRCI Road King Classic Base 1999
Harley Davidson FLHRI Road King Base 1996
Harley Davidson FLHRI Road King Base 1997
Harley Davidson FLHS Electra Glide Sport Base 1984
Harley Davidson FLHS Electra Glide Sport Base 1987
Harley Davidson FLHS Electra Glide Sport Base 1988
Harley Davidson FLHS Electra Glide Sport Base 1989
Harley Davidson FLHS Electra Glide Sport Base 1990
Harley Davidson FLHS Electra Glide Sport Base 1991
Harley Davidson FLHS Electra Glide Sport Base 1992
Harley Davidson FLHS Electra Glide Sport Base 1993
Harley Davidson FLHTC Electra Glide Classic Base 1984
Harley Davidson FLHTC Electra Glide Classic Base 1985
Harley Davidson FLHTC Electra Glide Classic Base 1986
Harley Davidson FLHTC Electra Glide Classic Base 1987
Harley Davidson FLHTC Electra Glide Classic Base 1988
Harley Davidson FLHTC Electra Glide Classic Base 1989
Harley Davidson FLHTC Electra Glide Classic Base 1990
Harley Davidson FLHTC Electra Glide Classic Base 1991
Harley Davidson FLHTC Electra Glide Classic Base 1992
Harley Davidson FLHTC Electra Glide Classic Base 1993
Harley Davidson FLHTC Electra Glide Classic Base 1994
Harley Davidson FLHTC Electra Glide Classic Base 1995
Harley Davidson FLHTC Electra Glide Classic Base 1996
Harley Davidson FLHTC Electra Glide Classic Base 1997
Harley Davidson FLHTC Electra Glide Classic Base 1998
Harley Davidson FLHTC Electra Glide Classic Base 1999
Harley Davidson FLHTCI Electra Glide Classic Base 1996
Harley Davidson FLHTCI Electra Glide Classic Base 1997
Harley Davidson FLHTCI Electra Glide Classic Base 1998
Harley Davidson FLHTCI Electra Glide Classic Base 1999
Harley Davidson FLHTCU Electra Glide Ultra Classic Base 1989
Harley Davidson FLHTCU Electra Glide Ultra Classic Base 1990
Harley Davidson FLHTCU Electra Glide Ultra Classic Base 1991
Harley Davidson FLHTCU Electra Glide Ultra Classic Base 1992
Harley Davidson FLHTCU Electra Glide Ultra Classic Base 1993
Harley Davidson FLHTCU Electra Glide Ultra Classic Base 1994
Harley Davidson FLHTCU Electra Glide Ultra Classic Base 1995
Harley Davidson FLHTCU Electra Glide Ultra Classic Base 1996
Harley Davidson FLHTCU Electra Glide Ultra Classic Base 1997
Harley Davidson FLST Heritage Softail Base 1986
Harley Davidson FLST Heritage Softail Base 1987
Harley Davidson FLST Heritage Softail Base 1988
Harley Davidson FLST Heritage Softail Base 1989
Harley Davidson FLST Heritage Softail Base 1990
Harley Davidson FLSTC Heritage Softail Classic Base 1988
Harley Davidson FLSTC Heritage Softail Classic Base 1989
Harley Davidson FLSTC Heritage Softail Classic Base 1990
Harley Davidson FLSTC Heritage Softail Classic Base 1991
Harley Davidson FLSTC Heritage Softail Classic Base 1992
Harley Davidson FLSTC Heritage Softail Classic Base 1993
Harley Davidson FLSTC Heritage Softail Classic Base 1994
Harley Davidson FLSTC Heritage Softail Classic Base 1995
Harley Davidson FLSTC Heritage Softail Classic Base 1996
Harley Davidson FLSTC Heritage Softail Classic Base 1997
Harley Davidson FLSTC Heritage Softail Classic Base 1998
Harley Davidson FLSTC Heritage Softail Classic Base 1999
Harley Davidson FLSTF Fat Boy Base 1990
Harley Davidson FLSTF Fat Boy Base 1991
Harley Davidson FLSTF Fat Boy Base 1992
Harley Davidson FLSTF Fat Boy Base 1993
Harley Davidson FLSTF Fat Boy Base 1994
Harley Davidson FLSTF Fat Boy Base 1995
Harley Davidson FLSTF Fat Boy Base 1996
Harley Davidson FLSTF Fat Boy Base 1997
Harley Davidson FLSTF Fat Boy Base 1998
Harley Davidson FLSTF Fat Boy Base 1999
Harley Davidson FLSTN Heritage Softail Special Base 1994
Harley Davidson FLSTN Heritage Softail Special Base 1995
Harley Davidson FLSTN Heritage Softail Special Base 1996
Harley Davidson FLTR Road Glide Base 1998
Harley Davidson FLTR Road Glide Base 1999
Harley Davidson FLTRI Road Glide Base 1998
Harley Davidson FLTRI Road Glide Base 1999
Harley Davidson FXD Dyna Super Glide Base 1995
Harley Davidson FXD Dyna Super Glide Base 1996
Harley Davidson FXD Dyna Super Glide Base 1997
Harley Davidson FXD Dyna Super Glide Base 1998
Harley Davidson FXD Dyna Super Glide Base 1999
Harley Davidson FXDL Dyna Low Rider Base 1993
Harley Davidson FXDL Dyna Low Rider Base 1994
Harley Davidson FXDL Dyna Low Rider Base 1995
Harley Davidson FXDL Dyna Low Rider Base 1996
Harley Davidson FXDL Dyna Low Rider Base 1997
Harley Davidson FXDL Dyna Low Rider Base 1998
Harley Davidson FXDL Dyna Low Rider Base 1999
Harley Davidson FXDWG Dyna Wide Glide Base 1993
Harley Davidson FXDWG Dyna Wide Glide Base 1994
Harley Davidson FXDWG Dyna Wide Glide Base 1995
Harley Davidson FXDWG Dyna Wide Glide Base 1996
Harley Davidson FXDWG Dyna Wide Glide Base 1997
Harley Davidson FXDWG Dyna Wide Glide Base 1998
Harley Davidson FXDWG Dyna Wide Glide Base 1999
Harley Davidson FXDX Dyna Super Glide Sport Base 1999
Harley Davidson FXLR Low Rider Custom Base 1987
Harley Davidson FXLR Low Rider Custom Base 1988
Harley Davidson FXLR Low Rider Custom Base 1989
Harley Davidson FXLR Low Rider Custom Base 1990
Harley Davidson FXLR Low Rider Custom Base 1991
Harley Davidson FXLR Low Rider Custom Base 1992
Harley Davidson FXLR Low Rider Custom Base 1993
Harley Davidson FXLR Low Rider Custom Base 1994
Harley Davidson FXR2 Base 1999
Harley Davidson FXR3 Base 1999
Harley Davidson FXRS Low Glide Base 1984
Harley Davidson FXRS Low Glide Base 1985
Harley Davidson FXRS Low Glide Base 1986
Harley Davidson FXRS Low Glide Base 1987
Harley Davidson FXRS Low Glide Base 1988
Harley Davidson FXRS Low Glide Base 1989
Harley Davidson FXRS Low Glide Base 1990
Harley Davidson FXRS Low Glide Base 1991
Harley Davidson FXRS Low Glide Base 1992
Harley Davidson FXRT Sport Glide Base 1984
Harley Davidson FXRT Sport Glide Base 1985
Harley Davidson FXRT Sport Glide Base 1986
Harley Davidson FXRT Sport Glide Base 1987
Harley Davidson FXRT Sport Glide Base 1988
Harley Davidson FXRT Sport Glide Base 1989
Harley Davidson FXRT Sport Glide Base 1990
Harley Davidson FXRT Sport Glide Base 1991
Harley Davidson FXRT Sport Glide Base 1992
Harley Davidson FXSB Low Rider - Belt Base 1984
Harley Davidson FXSB Low Rider - Belt Base 1985
Harley Davidson FXST Softail Standard Base 1984
Harley Davidson FXST Softail Standard Base 1985
Harley Davidson FXST Softail Standard Base 1986
Harley Davidson FXST Softail Standard Base 1987
Harley Davidson FXST Softail Standard Base 1988
Harley Davidson FXST Softail Standard Base 1989
Harley Davidson FXST Softail Standard Base 1990
Harley Davidson FXST Softail Standard Base 1991
Harley Davidson FXST Softail Standard Base 1992
Harley Davidson FXST Softail Standard Base 1993
Harley Davidson FXST Softail Standard Base 1994
Harley Davidson FXST Softail Standard Base 1995
Harley Davidson FXST Softail Standard Base 1996
Harley Davidson FXST Softail Standard Base 1997
Harley Davidson FXST Softail Standard Base 1998
Harley Davidson FXST Softail Standard Base 1999
Harley Davidson FXSTB Night Train Base 1999
Harley Davidson FXSTC Softail Custom Base 1986
Harley Davidson FXSTC Softail Custom Base 1987
Harley Davidson FXSTC Softail Custom Base 1988
Harley Davidson FXSTC Softail Custom Base 1989
Harley Davidson FXSTC Softail Custom Base 1990
Harley Davidson FXSTC Softail Custom Base 1991
Harley Davidson FXSTC Softail Custom Base 1992
Harley Davidson FXSTC Softail Custom Base 1993
Harley Davidson FXSTC Softail Custom Base 1994
Harley Davidson FXSTC Softail Custom Base 1995
Harley Davidson FXSTC Softail Custom Base 1996
Harley Davidson FXSTC Softail Custom Base 1997
Harley Davidson FXSTC Softail Custom Base 1998
Harley Davidson FXSTC Softail Custom Base 1999
Harley Davidson FXSTS Springer Softail Base 1988
Harley Davidson FXSTS Springer Softail Base 1989
Harley Davidson FXSTS Springer Softail Base 1990
Harley Davidson FXSTS Springer Softail Base 1991
Harley Davidson FXSTS Springer Softail Base 1992
Harley Davidson FXSTS Springer Softail Base 1993
Harley Davidson FXSTS Springer Softail Base 1994
Harley Davidson FXSTS Springer Softail Base 1995
Harley Davidson FXSTS Springer Softail Base 1996
Harley Davidson FXSTS Springer Softail Base 1997
Harley Davidson FXSTS Springer Softail Base 1998
Harley Davidson FXSTS Springer Softail Base 1999
Harley Davidson FXSTSB Bad Boy Base 1995
Harley Davidson FXSTSB Bad Boy Base 1996
Harley Davidson FXSTSB Bad Boy Base 1997
Harley Davidson FXWG Wide Glide Base 1984
Harley Davidson FXWG Wide Glide Base 1985
Harley Davidson FXWG Wide Glide Base 1986