S&S Cycle - S&S Performance Parts 2025 L - Volume 67
1936-'84
Phone: 608-627-1497
Fitment • 1936–’47 OHV big twins • S&S® KN-Series engines
1 -2017-UP 2 -2007-'17 3 -1999-'06 4 -1984-'99 5 -1936-'84 6 -XL-RA1250 7 -BELTS & GASKETS 8 -TOOLS 9 -WARRANTY 10 -APPENDIX
Features And Benefits • Quality construction—Made in-house by S&S Cycle in Viola, Wisc • Higher lift and increased valve timing for better performance Applications KN346 Cam : This is a service part cam for 74" knuckle engines The KN346 cam is ground to stock specifications KN420 Cam: This "high-lift" cam for modified knuckle engines features 420" valve lift and increased duration for larger engines up to 93" and compression ratio of up to 8 5:1 Special high-lift valve springs are required
CAM SPECIFICATIONS FOR 1936–’47 OHV BIG TWINS AND KN-SERIES ENGINES
Cam Timing (Open/Close)
Cam Duration
Lobe Centerline
Max Valve Lift
Valve Lift @ TDC
Cam Name
Intake
Exhaust 60°/30° 40°/12°
Intake
Exhaust
Intake
Exhaust
Intake
Exhaust
Intake
Exhaust
KN420 KN346*
31°/55° 10°/51°
266° 241°
270° 232°
102°
110° 104°
420" 346"
420" 346"
167" 085"
152" 100"
110 5°
*Ground to stock specifications.
CAMS FOR 1936–’47 OHV BIG TWINS & KN-SERIES ENGINES Cam Name Part # KN420 106-2409 KN346
106-3676 (HD-25522-36)
S&S can do a special order cam, please contact your S&S customer service representative for more information
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