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1926-1984 Vintage Models - S&S Cycle

1926-1984 Vintage Models - S&S Cycle

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<strong>1926</strong>-<strong>1984</strong> <strong>Vintage</strong> <strong>Models</strong>Flathead Power ® by S&S ®CamshaftsFor 1936-’47 OHV Big TwinsFlathead Power offers several cams for 1936-’47 OHV big twins. The KN420 cams are usedin the Flathead Power KN93 engines, and the KN421 can be used in large displacementknucklehead engine projects. The third cam for knucklehead engines is the KN346, whichis a stock replacement cam for 74" knucklehead engines. All of these cams are designed foruse with solid lifters, and will fit in stock or Flathead Power crankcases.Parts forTwin Cam 96 /103 2007-2012Parts forTwin Cam 88 ®1999-2006Fitment• 1936-’47 OHV big twins• Flathead Power KN-Series enginesParts forEvolution ®<strong>1984</strong>-1999Features and benefits• Quality construction – Made in-house by S&S <strong>Cycle</strong> in Viola, WI• Higher lift and increased valve timing for better performanceApplicationsKN346 Cam: This is a stock replacement cam for 74" knuckle engines. The KN346 camis ground to stock specifications.KN420 Cam: This "high-lift" cam for modified knuckle engines features .420" valve liftand increased duration for larger engines up to 93" and compression ratio of up to 8.5:1.Special high-lift valve springs are required.NEW! KN420K Cam: A specialty cam used in our KN Kone engine. A direct copyof our Flathead Power 420 cam grind, the 420K is designed to fit our 70-99 KN-Konecrankcase and KN-Kone gearcover. Complete with the mached snout to mate up to70-99 stock style ignition system components.KN421 Cam: The KN421 cam is intended for large displacement engines such as the 103"engines produced by the original Flathead Power company. .420" valve lift with longerduration than the KN420. Special high-lift valve springs are required.Part numbersFlathead Power Cams For 1936-’47 OHV big twins & KN-Series EnginesKN421 .................................................. 106-2408KN420 .................................................. 106-2409KN420K ................................................. 330-0075KN346 .................................................. 106-3676Flathead Power® camshafts for 1936-'47 OHV big twins are available for stock replacementand performance applications. The crankcase bearing end of these cams is ground to the correctdiameter for a needle bearing. If used in a stock crankcase with bushing style bearings, it is theengine builders responsibility to ensure that there is adequate clearance between the bushingand the cam.PERFORMANCEPARTSParts forSportster ® & Buell ®1986-2012Parts for<strong>Vintage</strong> Engines<strong>1926</strong>-<strong>1984</strong>Parts forX-Wedge®2007-2012Parts forVictory®, Off-road& MetricRacingProductsTools & ShopSuppliesFlathead Power® Cam Specifications For 1936-’47 OHV Big Twins and KN-Series EnginesCam NameCam Timing (Open/Close) Cam Duration Lobe Centerline Max Valve Lift Valve Lift @ TDCIntake Exhaust Intake Exhaust Intake Exhaust Intake Exhaust Intake ExhaustKN421 38°/62° 70°/30° 280° 280° 102° 110° .420" .420" .191" .152"KN420 31°/55° 60°/30° 266° 270° 102° 110° .420" .420" .167" .152"KN346* 10°/51° 40°/12° 241° 232° 110.5° 104° .346" .346" .085" .100"*Ground to stock specifications.S&S can do a special order cam, please contact your S&S customer service representative for more informationDealer Services& Promo ItemsWarranty &Company PolicyOEM Cross ReferenceAppendix & IndexVisit us at www.sscycle.com5-29

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