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S&S 540 Big Bore Cam Chest Kit for Harley

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This product is legal in California only for racing vehicles which may never be used, registered or licensed for use upon a highway.

S&S 540C/G Cam Chest Kit For Harley

Big horsepower numbers are the status symbol of a performance engine, but more often than not, the bolstered torque spec is what you really feel when riding it. This is particularly relevant for the heavy touring machines as it’s torque that rockets you onto the highway and it’s definitely torque that lets you effortlessly push a loaded bagger around slower traffic. Produce stump pulling torque down low in the RPM range as well as maintain respectable horsepower numbers.


  • The 540 is designed to work with the S&S 124” and 128” big bore kits
  • Kits include cam, oil pump, cam plate, pushrods, pushrod tubes, tappets, tappet cuffs, valve springs, top and bottom collars, keepers, and seals
  • Gear drive kits include drive gears
  • Made in the USA

Oil Pump/Cam Plate Info:

  • Precision machined from billet aluminum
  • Passage plugs removable for servicing
  • Independent scavenge sections for flywheel cavity and cam chest
  • Debris screens in both scavenge pickups
  • Magnet in cam chest to help stop debris from entering oil pump
  • 44% flow increase on supply side and 58% on scavenge side
  • Pressure relief valve is adjustable with unit installed

540 Cam Info:

  • Front Intake open/close 17.7°/30.6°
  • Front Exhaust open/close 21.2°/33.9°
  • Rear Intake open/close 14.9°/28.7°
  • Rear Exhaust open/close 37.7°/26.9°
  • Front Intake duration 228.3°
  • Rear Intake duration 223.6°
  • Front Exhaust duration 235.1°
  • Rear Exhaust duration 244.6°
  • Intake Lift .540"
  • Exhaust Lift .540"
  • Front Intake Lobe Center Line 96.4°
  • Front Exhaust Lobe Center Line 83.6°
  • Rear Intake Lobe Center Line 96.9°
  • Rear Exhaust Lobe Center Line 95.4°
  • Front Intake Lift at TDC .175"
  • Front Exhaust Lift at TDC .262"
  • Rear Intake Lift at TDC .161"
  • Rear Exhaust Lift at TDC .216"
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