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Converting from the stock chain driven cams to gear driven cams improves valve timing accuracy by eliminating timing chain lash. Another advantage is that you loose the chain tensioner shoes that wear out or even fail. Bolt-in cams do not require head work.
Easy Start cams start any engine regardless of displacement or compression ratio, using your stock starter. Consequently, they save your starter and battery. They work automatic, no buttons to push. The two exhaust cam lobes are equipped with a spring loaded compression release lobe on the "heel" of the cam at the point where the valve would normally be fully closed. The lobe holds the exhaust valve open slightly at cranking speed. This releases some of the compression, making the engine much easier to crank. Once the engine starts, and rpm increases, the compression release lobe is centrifugally retracted and the engine runs normally, with full compression, and without any loss in performance. Easy Start cams have been tested for 100,000 accumulative starts and over 150,000 road miles without breakage or compression release failure.
Complete S&S gear drive camshaft kits contain front and rear cam, all gears, gear cover gasket, bearings, retaining ring, o-ring, thread lock and instructions. For those who have already converted gear drive and just want to change to Easy Start cams and/or valve timing we also have cams with just the inner gears available.

Notes:
Stock valve springs in 1999 thru 2004 Twin Cams can handle cams with valve lifts as high as .515". Stock valve springs in 2005 to present Twin Cams can accommodate valve lifts up to .590". The OES, 505C and 557 grind cams can be installed using the stock pushrods. However, we recommend S&S Quickee Adjustable pushrods ZPN 752108 for easy installation of all S&S cams.

640 grind:
Used in S&S T124 engines, this cam makes horsepower! Intended for engines of 95 CID or more w/ compression ratios between 10.5:1 and 11.5:1. 3000-6000 rpm.

675 grind:
A high lift monster, this cam set is designed for 120" or larger engines with at least 11:1 compression ratio. 4500-6500 rpm.

Specifications

S&S GEAR DRIVE CAM KITS FOR TWIN CAM
1999 thru 2006 except 2006 Dyna 2006 Dyna and all 2007-2017 Twin Cam
Standard Cams Easy Start Cams Standard Cams Easy Start Cams
Grind Kit Cams only Kit Cams only Kit Cams only Kit Cams only
OES
509
510
546 752089
€ 644,84

€ 515,87
551 760748
€ 445,88

€ 349,60
751553
€ 560,78

€ 439,70
751546
€ 560,78

€ 439,70
557 760621
€ 560,78

€ 439,70
570 751547
€ 560,78

€ 439,70
583 751555
€ 560,78

€ 439,70
585
625 752092
€ 727,67

€ 570,54
721945
€ 465,94

€ 365,34
640 721947
€ 465,94

€ 365,34
675 750634
€ 415,56

€ 198,17
751559
€ 560,78

€ 439,70
751552
€ 560,78

€ 439,70
MR103
HP103 760750
€ 699,39

€ 548,37
760762
€ 452,28

€ 354,62
760623
€ 560,78

€ 439,70
635HO
S&S CAM SPECIFICATIONS
Valve Timing Valve Duration Valve Lift Centerline Lift@TDC
Cam grind Intake Exhaust
Open/Close Open/Close Intake Exhaust Intake Exhaust Intake Exhaust
475 (OES) 1999-2006 2°/34° 36°/4° 216° 220° .475" 106° 106° .060" .060"
475 (OES) 2007-up -9°/25° 42°/-3° 196° 219° .474" 107° 112.5° .087" .110"
505 13°/33° 42°/14° 226° 236° .505" n/a n/a .147" .152"
509 18°/18° 46°/11° 216° 237° .509" 90° 107.5° .174" .140"
510 20°/38° 52°/20° 238° 252° .510" 99° 106° .187" .178"
546 5°/55° 52°/5° 240° 237° .546" 115° 113.5° .126" .106"
551 15°/20° 39°/18° 215° 237° .551" 92.5° 100.5° .163" .179"
557 6°/27° 39°/12° 212° 231° .557" 100° 103° .113" .146"
570 20°/40° 55°/20° 240° 255° .570" 100° 107.5° .187" .179"
583 5°/18° 58°/24° 203° 262° .583" 96.5° 107° .113" .206"
585 20°/45° 60°/20° 245° 260° .585" 102.5° 110° .186" .179"
625 20°/55° 60°/20° 255° 260° .625" 107.5° 110° .189" .184"
635HO 19.5°/43.5° 58.5°/37.5° 243° 276° .635" 102° 100.5° .186" .284"
640 25°/60° 65°/25° 265° 270° .640" 107.5° 110° .228" .214"
675 25°/64° 70°/25° 269° 275° .675" 109.5° 112.5° .235" .205"
MR103 13°/33° 50°/22° 226° 249° .585" 100° 104° .172" .177"
HP103 20°/49° 45°/26° 249° 251° .575" 102.7° 101.5° .199" .206"

Recommended Retail Prices excluding sales tax.

Prices exclude shipping, import duties and installation.