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.
|
