Cam Specs & Overview

Recommended Applications for S&S Cams 1999-2017:

HP103: For the rider who really wants the most top end horsepower. Easily make 100 horses from a stock engine with S&S intake and exhaust. Ideal for lighter bikes and racing applications where getting the most horsepower from a stock engine is imperative.

MR103: These bolt in-cams are for the rider who wants more of everything without giving up low end torque for high rpm horsepower, or vice versa. More power all across the wide power band, from idle to red line.

475: A bolt-in Stock replacement for Twin Cam engines.

509: Designed as a bolt-in, high torque cam for 1999-'06 models. 180 psi cranking compression, no need for compression releases. For 88 CID engines with stock compression ratio. Idle-4500 rpm. Bolt-in torque.

510: Designed as a bolt-in cam for 88, 95, and 96 CID engines with compression ratios below 9.7:1, it is primarily intended for use with stock, un-ported heads. 3000-5500 rpm. Bolt-in overall.

551: Designed for engines with 96 to 106 CID and 9:1 to 9:9 compression. This is a bolt-in cam set designed for stock or mildly modified touring bikes. 551 cams are not recommended for compression ratios of 10:1 or greater. Greatly improves low-end and midrange torque, strongest from idle-4000rpm. 

557: Designed for Tri-Glide® models, this bolt-in cam, with it’s short duration, produces lots of useable torque. The camshaft’s stock base circle permits the use of stock pushrods. However, we recommend S&S Quickee pushrods for easy installation. 557 camshafts are available in chain or gear driven versions. Both come with our Easy Start automatic compression release feature for quick starts. Fits all 2009-2012 Harley-Davidson®Tri-Glide® models. Bolt-in.

570: Designed for 88 to 96 CID engines with compression ratios between 9:1 and 10:1 this cam will provide a nice power increase across the entire power band. 3200-5700 rpm. Excellent bolt-in for overall power on a 103". Bolt-in overall.

583: Optimized for use in the Softail®/Dyna® lines, this cam makes horsepower and torque that you can feel all the way through the rpm range, making the most power right where you need it:1500–5000rpm. Bolt-in.

S&S® offers a variety of cam grinds for 1999-up big twin engines in both chain drive and gear drive versions. Cams that exceed the limits of the stock valve springs require the use of special high lift springs. Most S&S cams have higher lift than stock and are designed to take advantage of the extra flow of ported stock heads or S&S Super Stock® heads. Due to the high lift of these cams, S&S adjustable pushrods are recommended. Not all grinds are available in the chain drive version. To get the best performance from a performance cam installation, a high flow intake and exhaust system is also recommended.

EASY START CAMS

Start any engine regardless of displacement or compression ratio, with a stock starter. The most innovative S&S product since the electric compression release system, these cams will revolutionize the starting of late model big twins. These cams also install just as easily as non compression release versions and require no extra parts or machining! Available in both economical chain drive and rock-solid gear drive. Don't get caught "dead" without them!

How do Easy Start Cams Works

The heart of our Easy Start cams is a centrifugally retracted, spring loaded, compression release lobe milled into the heel of each exhaust lobe. At cranking speeds, the lobe bumps the exhaust valve open slightly during the compression stroke, making the engine much easier to turn over. Once the engine fires and reaches 800 RPM, the lobe swings out of the tappet roller path, allowing the engine to run normally and with full compression.

Features & Benefits of S&S Easy Start Cams:

• Start any engine with a stock starter
• Save your starter and battery!
• Reliable – tested for 100,000 accumulative starts and over 150,000 road miles
  without breakage or compression release failure!
• Automatic – no buttons to push

Compare S&S Cams To Other Popular Cams

Recommended applications for S&S Cams: 1984-1999