S&S Cam Chest Kit for Harley Davidson Twin Cam
If you're looking for a set of new performance cams, think about all the other components in the cam chest that you could upgrade while you are at it, saving the time for riding instead! This S&S kit contains a set of standard or easy start cams, a precision tolerance replacement oil pump, cam support plate, performance hydraulic tappets and adjustable pushrods that can be fitted without disassembling the top-end. The effects besides crazy performance? More consistent oil pressure and 99-06 models are upgraded to the 07-17 style oil pump.
Choose between chain or gear driven cams. Kits for gear driven cams include all parts necessary to convert to gear drive for improved cam timing accuracy and eliminate the stock cam chain tensioner.
All sets come with bolt-in camshafts for ease of installation.
S&S Chain Drive Camshaft Only Kit available here
S&S Gear Drive Camshaft Only Kit available here
Note: 1999–2004 stock valve springs will handle camshafts with lift up to 0.510". If a camshaft with higher lift is installed, such as 551 or 585, high lift valve springs must be used.
Features:
- All parts in each kit are matched to ensure superior quality, fit, finish and performance
- Kits include cam, oil pump, cam plate, pushrods, pushrod tubes, tappets, tappet cuffs, valve springs, top and bottom collars, keepers and seals
- Improved engine performance – higher lift and optimized cam timing
- Gear-drive kits offer peace of mind – no more worries about cam chain failure
- Chain-drive kits include S&S Hydraulic cam chain tensioners for improved valve timing and chain life
- Kits for 99-06 models feature an 07-17 style oil pump for better, more consistent oil pressure
509 Camshaft
- Designed as a bolt-in, high torque cam for 99-06 models with 88" engines and stock compression ratio
- Complete kit ready to install
- Compression releases are not necessary with this cam
- Great low and midrange torque
- Strongest from 1000 - 4500 RPM
510 Camshaft
- Designed as a bolt-in, high torque cam for models with 88/95/96" engines and compression ratio below 9.7:1
- Complete kit ready to install
- Great midrange torque
- Strongest from 3000 - 5500 RPM
551 Camshaft
- Optimized for 88/96/103/106” Touring bikes with slip-on mufflers and 9:1 to 9:9 compression
- Best bolt-in cam available for most 05-16 Dressers
- Complete kit ready to install on 05-up Twin Cams. 99-04 models require separately available high lift valve springs
- Greatly improves low-end and midrange torque
- Strongest from 1000 - 4000 RPM
583 Camshaft
- Designed for use as a great overall cam for Softail and Dyna, but can be used in any Big Twin application
- Complete kit ready to install on 05-up Twin Cams. 99-04 models require separately available high lift valve springs
- Provides strong low-end torque and horsepower you can really feel all the way through the rpm range, making the most power right where you need it
- Strongest from 1500 -5000 RPM
585 Camshaft
- 585 cams are designed for 88"-95" engines with compression ratios from 9.7:1 to 10.5:1 and 100"-124" engines with compression ratios from 9:1 to 10:1
- Complete kit ready to install on 05-up Twin Cams. 99-04 models require separately available high lift valve springs
- Provides massive horsepower and torque increases starting at 3000rpm and holds steady all the way to redline
- Strongest from 3500-6000 rpm for 88"-103" engines and 2500-5500 for larger engines
What is Easy Start Cams?
Start any engine regardless of displacement or compression ratio with the 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 without them!
How do Easy Start Cams Work?
The heart of the 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.
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 without breakage or compression release failure!
- Automatic – no buttons to push
Instructions
Cam specifications
| Cam |
Valve Timing (open/close) |
Valve Duration |
Valve Lift |
Centerline |
Lift @ TDC |
| Intake |
Exhaust |
Intake |
Exhaust |
Intake |
Exhaust |
Intake |
Exhaust |
| Open BTDC/Close ABDC |
Open BBDC/Close ATDC |
| HP103 |
20˚/49˚ |
50˚/22˚ |
249˚ |
251˚ |
.575" |
102.7˚ |
101.5˚ |
.199" |
.206" |
| MR103 |
13˚/33˚ |
50˚/22˚ |
226˚ |
252˚ |
.585" |
100˚ |
104˚ |
.097" |
.191" |
| 475 |
2˚/34˚ |
36˚/4˚ |
216˚ |
220˚ |
.475" |
106˚ |
106˚ |
.060" |
.060" |
| 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** |
17°/19° |
41°/17° |
216° |
238° |
.550" |
91˚ |
102˚ |
.178" |
.170" |
| 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" |
|
Note: Although several cam grinds were used in stock engines from 1999-’06, the timing specs of the 475G cams is most similar to cams used in 1999-’03 EFI engines. **551 cams are not recommended with compression ratio of 10:1 or higher. |
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Note: Stock valve springs in 1999-’04 big twin models can handle cams with valve lifts as high as .515". Stock valve springs in 2005-up engines can accommodate valve lifts up to .590". |
