S&S CAMS FOR EVOLUTION BIG TWIN

S&S claims that their camshafts and other related valve train parts go through extensive dyno testing and usage on the track and street. After they are satisfied with the proven performance they carefully select and match various components to make the best kit combinations. Since many S&S cams are high lift types, they are available with a cam only or in a kit with a set of the appropriate S&S high performance valve springs. Refer to the Cam Specification Chart for cam timing and lift information.

Important information on S&S Evolution Style Cams in S&S Shovelhead Style Engines
S&S complete Shovelhead engines are equipped with special tappet guides designed to use S&S Evolution style tappets. This requires that an Evolution style cam must be used in these engines, or in any engine equipped with S&S Shovelhead style tappet guides. When choosing a cam for this type of engine, be aware that the timing specifications will remain unchanged, but that the total valve lift will be reduced by about 9% from the specified value, due to the difference in rocker ratios between Shovelhead and Evolution style engines.

S&S 508 GRIND
Bolt-in cam for stock 80 CI (1,340 cc) engines with less than 10:1 compression ratio. Quiet valve train with excellent low and mid range torque for touring and 2-up riding. Works with stock push rods, stock valve springs and hydraulic tappets.

S&S 510V GRIND
Replacement of the popular S&S 502 cam, but with better low and midrange torque and improved ramp design for quieter operation. Will bolt in with stock or mildly ported heads, stock push rods and hydraulic tappets. Works best with 9:1 to 10:1 compression ratio and up 96 CI.

S&S 520 GRIND
Provides good low end and mid range performance in engines up to 96CI with 8.5:1 to 10:1 compression ratio. Use with hydraulic lifters and adjustable push rods.

S&S 561 GRIND
The best cam available for 80 to 96 CI engines with a 9.5:1 to 10.5:1 compression ratio, hydraulic tappets and adjustable push rods.

S&S 585V GRIND
For 80 thru 96 CI engine with 10:1 thru 10.5:1 compression ratio, or larger engines with a 9.5:1 to 10:1 compression ratio. Use with hydraulic tappets and adjustable push rods.

S&S 600 GRIND
For 80 thru 96 CI engine with 10.5:1 thru 11:1 compression ratio, or larger engines with a 10:1 to 10.5:1 compression ratio. Use with hydraulic tappets and adjustable push rods.

S&S 631 GRIND
The Hottest cam for all High RPM engines with 11:1 and higher compression ratio, or 12:1 and over in smaller bore engines. Works with Solid or Hydraulic tappets and adjustable push rods.

S&S 640 GRIND
For real Big Inch engines with 10:1 thru 11.5: 1 compression ratio. Works with hydraulic tappets and adjustable push rods. The camshaft that comes standard in S&S 124 CI Super Side Winder motors.