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S&S 640 Camshaft

Item: 359321

$269.96

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Description Fitment Reviews Q&A

S&S 640 Camshaft

This 640 is for Evolution 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. The nice part is that this cam does not require as much compression as the 631.

  • Made in the USA

Product Note: Spring spacing is required for use with hydraulic tappets.

Specification Details
Country of Origin USA
Engine Type Evolution Big Twin
Exhaust Duration 270 degrees
Exhaust Lift .214 in.
Exhaust Lobe Center 110 degrees
Exhaust Timing (Close) 25 degrees
Exhaust Timing (Open) 65 degrees
Intake Duration 265 degrees
Intake Lift .228 in.
Intake Lobe Center 107.5 degrees
Intake Timing (Close) 60 degrees
Intake Timing (Open) 25 degrees
Valve Lift .640 in.

Vehicle Fitment

Fitment is guaranteed or your money back plus free return shipping.
Don’t waste time installing a product that doesn't fit. We worked hard ensuring that this product is an exact fit on the vehicles listed below.

Harley Davidson
  • FLHR Road King 1995-1998
  • FLHRCI Road King Classic 1998
  • FLHRI Road King 1996-1998
  • FLHT Electra Glide Standard 1995-1998
  • FLHTC Electra Glide Classic 1995-1998
  • FLHTCI Electra Glide Classic 1996-1998
  • FLHTCU Ultra Classic Electra Glide 1995-1998
  • FLHTCUI Ultra Classic Electra Glide 1995-1998
  • FLSTC Heritage Softail Classic 1995-1998
  • FLSTF Softail Fat Boy 1995-1998
  • FLSTN Heritage Softail Special 1995-1996
  • FLSTS Heritage Springer Softail 1997-1998
  • FLTCU Ultra Classic Tour Glide 1995
  • FLTCUI Ultra Classic Tour Glide 1996
  • FLTR Road Glide 1998
  • FLTRI Road Glide 1998
  • FXD Dyna Super Glide 1995-1998
  • FXDL Dyna Low Rider 1995-1998
  • FXDS-CONV Dyna Convertible 1995-1998
  • FXDWG Dyna Wide Glide 1995-1998
  • FXSTC Softail Custom 1995-1998
  • FXSTS Springer Softail 1995-1998
  • FXSTSB Softail Bad Boy 1995-1997

Customer Reviews

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Questions & Answers

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What other upgrades are needed to run this cam

Other than adjusting fuel delivery, there isn't much to adding this cam to any of the bikes listed in our fit guide. The only exception being if you're running hydraulic lifters, then you'll need to carefully look after valve spring spacing. Now, why anyone would not do that anyway, is beyond me - you're already in there so you might as well take care of those kinds of critical measurements to be sure your engine is in good nick.

By Tom
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