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PERFORMANCE MOTORCYCLE PARTS AND KITS FOR AMERICAN V-TWINS

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.640 Inch Lift Camshaft–Generator

 
$189.95
SKU:
106-4639
Qty:
 
Dealer Only Item

 
 
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Description
Product Reviews
Specs
Fitment
Instructions

This generator style .640 inch lift cam shaft is used in custom build engines. These cams are designed to fit the following:

  • 1954-1965 engines with S&S Head Update kit
  • 1966-1969 engines with Hydraulic Conversion kit
  • P-Series and SH-Series generator style engines
  • Custom generator style engines with 1984-1999 style top end

 

 

Cam Specifications for 1954–’84 Big Twin Engines Requiring 1984–'99 Style Cams 
Cam Application 
Generator Part # Alternator Part # Valve Timing1 Open/Close   Valve Duration   Valve Lift Lift @ TDC2   Spring Spacing Required Tappet Type Required
Intake   Exhaust   Intake  Exhaust  Intake   Exhaust  
513 74"–84" Stock or low compression  106-6028   106-6027   18°/38°   40°/18°   236°  238°   .472"   .163"
.187"   No   Hydraulic  
585 74"–80" engines 8.5:1 - 9.5:1 CR 84" - 93" up to 8:1 - 9:1 CR   33-5131   33-5109 20°/45°   60°/20°   245°  260°   .540"   .172"
.166"   Yes   Hydraulic  
600 93"–103" engines 9:1 - 10:1 CR   33-5132   33-5058   20°/55°   60°/20°   255°   260°   .554"   .177"   .170"   Yes   Hydraulic  
631 High RPM Cam for 93"–103" Engines 11:1+ CR   33-5078   33-5080   34°/61°   66°/29°   275°   275°   .581"   .359"   .204"   Yes   Solid or Hydraulic  
640 93"–Up Engines 10:1 or Greater Compression
106-4639   33-5108   25°/60°   65°/20°   265°  265°   .590"   .205"
.192"   Yes   Hydraulic  

1Timing designation is function of zero lash @ .053" off base circle. Lifts based on 1.5:1 Rocker Ratio.  2Lifts at TDC are measured at the valve and are for reference only. Overlap valve lifts must be checked on assembled motor. 

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