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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