Speedo Seats & Luggage- racks Frame Chassis Suspension Forktubes Wheels Brake Fenders Gastanks Motorparts Gaskets Intake Transmission & Driveline Exhaust Electrical & Lights Handlebars, Cables & Mirrors Oil tanks Oil & Chemicals Fasteners Windshields Forward controls, Footpegs Miscellaneous MOTOR PARTS - LOWER END 10 615 AFTERMARKET PARTS & ACCESSORIES FOR CUSTOM MOTORCYCLES / MOTORCYCLESTOREHOUSE.COM 531282 PAN, KNUCKLE & SHOVEL 36-84 KNUCKLE, PAN, SHOVEL CAMS KNUCKLEHEADS Cams for 36-47 Knuckles and the S&S KN-series engines. S&S KN346 CAM Bolt-in. .346" valve lift. OEM 74" Knucklehead replacement grind, cam is ground to stock specifications. Compatible with all OEM components. 531945 36-47 Knuckle S&S KN420 CAM High lift cam for modified Knuckleheads. .420" valve lift and longer duration for engines with up to 93" and up to 8.5:1 Compression ratio. High lift valve springs are required. 531944 36-47 Knuckle PAN & SHOVELHEADS S&S H GRIND CAM (SERVICE PART) Exact reproduction of stock camshafts with identical timing specs & lifts for a 100% correct restoration project. 532548 48-57 Panhead 532549 58-69 Panhead / Early Shovel 532550 70-E77 Shovel 532551 L77-84 Shovel S&S 450S CAM Engines up to 88" with up to 8.5:1CR. Good low and midrange torque. Gives .475" valve lift for Panhead and .453" valve lift for Shovel. For hydraulic lifters, can also be used with solids. 531275 48-69 Pan, Shovel 531276 70-E77 Shovel 531277 L77-84 Shovel S&S 514 CAM For 84" to 93" strokers with no greater than 9:1 CR. Best gains occur in the mid range from 2500 to 5000 rpm where most riding is done. Relatively quiet and easier on the valve train than most other cams with lifts as high. Solid lifters or aftermarket hydraulic tappets are recommended, valve spring spacing and other normal clearancing checks required. 2500–5000 RPM.Gives .540" valve lift for Panhead, .514" valve lift for Shovel. For solid lifters. 503567 48-69 Pan, Shovel 503569 70-E77 Shovel 503571 L77-84 Shovel S&S 560S CAM 88" to 103" engines with 9:1 to 10.1:1 CR. Strong power. Gives .560" valve lift for Shovel. For solid lifters and high lift springs. Clearance checks required. 531279 70-E77 Shovel 531280 L77-84 Shovel S&S 565S CAM 98" to 103" engines with 10:1 to 12:1CR. Strong power. Gives .593" lift for Panhead, .565" for Shovel. For solid lifters and hig lift springs. Clearance checks required. 531281 48-69 Pan, Shovel 531282 70-E77 Shovel -- L77-84 Shovel S&S 48-84 BIG TWIN CAMSHAFTS S&S cams are designed and made by the company with most Harley High-Performance experience in the world. Extensive dyno & street testing by S&S ensure you of a cam with 'Proven Performance' for the best obtainable real-world result on the street, right where it counts! Camshaft installing *Most 36-99 Big Twin high performance cams need a minor crankcase modification at the inner rear intake camshaft lobe (closest to the flywheels). Check for adequate free play between this inner cam lobe and the crankcase bearing boss. If needed some material from the crankcase must be removed. *Proper end play of the installed camshaft is .010/.015". Mount cam cover, using the old gasket to get correct reading of free play on your new cam. When correct end play has been established the new gasket can be used for final mounting. *92-99 Evo Big Twin models may be equipped with inner camshaft bearings, marked 'INA SCE 138 USA'. It is advised to replace this bearing with a full-needle Torrington camshaft bearing. Torrington (now Koyo brand) camshaft bearings (MCS 511350. Repl. 9058) were used in all Evo B.T. engines up to 1992. These earlier style bearings have more needles for a higher load rating and are less prone to failure. Information provided by Andrews Products, Inc. tech-tip 60 S&S CAMSHAFT SPECIFICATION CHART Intake° Exhaust° Duration° Valve Lift Valve Lift TDC Open/Close Open/Close In/Ex In/Ex In/Ex Knucklehead KN346 10/51 40/12 241/232 .346/.346 .085"/.100" KN420 31/55 60/30 266/270 .420/.420 .167"/.152" KN421 38/62 70/30 280/280 .102/.110 .191"/.152" Panhead H front 0/40 53/12 220/245 .389/.391" .076"/.131" H rear 20/33 53/12 233/245 .391/.390" .076"/.131" 450S 18/38 40/18 236/238 .475" 158"/152" 514 23/43 43/23 246/246 .540" .177"/177" 560S 20/55 60/20 255/260 .587" .176"/172" 565S 25/60 65/25 265/270 .593" .195"/.183" Shovelhead H front 0/40 53/12 220/245 .389/.391" .076"/.131" H rear 20/33 53/12 233/245 .391/.390" .076"/.131" 450S 18/38 40/18 236/238 .453" 151"/145" 514 23/43 43/23 246/246 .514" .169"/.169" 560S 20/55 60/20 255/260 .560" .168"/.164" 565S 25/60 65/25 265/270 .565" .185"/.175" Timing and duration measured at zero lash and .053" tappet lift off base circle. Note that Panhead TDC valve lifts will approximately be 5% higher than Shovel due to the different Panhead rockerarm geometry. To avoid coil bind, allow min. .030" more free valve travel than the max. valve lift that is mentioned. To achieve adequate valve spring clearance, several higher lift top collars are available which require no machining. Rocker arm ratio How do I determine the valve lift of my current cam? Measure the highest point of the cam lobe. Now measure the lowest point (cam base circle). Substract the 'lowest point' from the 'highest point'. You now have cam lift. To calculate valve lift multiply cam lift by rocker arm ratio (for instance you measured a cam lift of 0.309375" on a Evo Big Twin cam. 0.309375 x 1.6 = 0.495" valve lift). Stock rocker arm ratio Twin Cam models: 1.60:1 Stock rocker arm ratio all Evo models: 1.60:1 Stock rocker arm ratio Shovelheads: 1.42:1 Stock rocker arm ratio Panhead: 1.50:1 Stock rocker arm ratio Knuckle: 1.00:1 Stock rocker arm ratio UL 80": 1.00:1 Information provided by Andrews Products, Inc. tech-tip 61
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