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PERFORMANCE MOTORCYCLE PARTS AND KITS FOR AMERICAN V-TWINS

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.640 Lift Camshaft—Alternator

 
$189.95
SKU:
33-5108
Qty:
 
Dealer Only Item

 
 
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Description
Product Reviews
Specs
Fitment
Instructions

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.

 

These camshafts are also for 1954–’84 big twins with either the Hydraulic Conversion kit or the Cylinder Head Replacement kit for panhead engines. They are also replacement parts for Flathead Power® P-Series and SH-Series engines. Since these kits and engines include 1984–’99 style hydraulic lifters, the larger late style roller diameter requires that cams designed for 1984–’99 models must be used to achieve correct valve timing.

 

View Cam Specs

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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