Best Cam For A Harley

If you need to know the best cam for a Harley, then you have come to the right place. DC V-Twin has been the place to shop for the best cam for a Harley. With a thousand of Harley cams available, from different manufacturers, making the correct choice can sometimes be over whelming. Our goal is to make your decision less complicated and put the right cam in your Harley that you will get the results you are after.

One of the first steps in picking the best cam for a Harley is to determine what you plan on doing with the bike. Will you be using the bike for typical street riding and touring for pleasure or will it be an all-out drag bike? The type of riding you do will also be important. Do you mostly ride two up, around town traffic, or do you make long highway trips. Finally, we would like to know your riding style. Is it aggressive or conservative?

Once we have this information then we can start helping you pick the best cam for a Harley. Of course now that we know your riding habits, we will need to know what bike you have and any engine modifications you may have already made. This is very critical, especially with the twin cam engine that has been around since 1999 with several different cubic inch versions over the years. DC V-Twin can also help you pick the best cam for a Harley EVO if you have an older style bike too.

Before we jump into picking the best cam for a Harley, we need to bring a couple habits of cam shafts to light as well. One being that a cam that is too big will result in less than favorable low RPM power. While these bigger cams are necessary in modified engine builds, a more conservative cam may feel stronger to you in your street riding style. It’s all about picking the best cam for a Harley.

Another thing to consider is a cam with longer intake duration will reduce static compression at low speed. This will reduce low RPM torque. Now, a longer duration cam combined with higher compression will add power to the middle and higher RPMs. This is what most riders are after, but the most important thing is to have the cam match the compression ratio and displacement of the engine, plus having the bike properly tuned.

DC V-Twin will pick the best cam for your Harley……………..Call 478-988-4313 we are here to help you with some of our favorites below.

RECOMMENDED APPLICATIONS FOR S&S CAMS 1999 AND UP

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.

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.

585: Designed for 88 to 95 CID engines with compression ratios from 9.7:1 to 10.5:1 and 100 to 124 CID engines from 9:1 to 10:1 compression. Provides massive horsepower and torque increases starting at 3000rpm and holds steady all the way to redline. 3500-6000 rpm for 88" - 103" engines and 2500-5500 for larger engines.

640: 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.

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”.

 

 


Specs
CamValve TimingValve DurationValve LiftLobe Center LineValve Lift @ TDC
IntakeExhaustIntakeExhaustIntakeExhaustIntakeExhaustIntakeExhaust
BTDCABDCBBDCATDC
MR103 13° 33° 50° 22° 226° 252° .585" .585" 100° 104° .097" .191"
HP103 20° 49° 45° 26° 249° 251° .575" .575" 102.7° 101.5° .199" .206"
635 H.O. 19.5° 43.5° 58.5° 37.5° 243° 276° .635" .635" 102° 100.5° .186" .284"

 

EASY START CAMS FOR YOUR HARLEY

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 ESAY START CAMS WORK

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.

  • 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
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.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".

 


 

Specs for S&S® Chain Drive & Gear Drive Camshafts for 1999-Up Big Twins

CamValve Timing (open/close)Valve DurationValve LiftCenterlineLift @ TDC
IntakeExhaustIntakeExhaustIntakeExhaustIntakeExhaust
HP103 20˚/49˚ 50˚/22˚ 249˚ 251˚ .575" 102.7˚ 101.5˚ .199" .206"
MR103 13˚/33˚ 50˚/72˚ 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"

NEW SINGLE ROLLER LINK CHAIN DRIVE CAMS BY BOBBY WOODS

Part#.053 TimingDuration .053Valve LiftLift TDCSpringsApplication
TW-5-6

17/37

39/15

234

234

.575

.575

.174

.160
Stock Maximum Low-End Torque – Bolt-In w/Stock Heads
TW-222

14/34

34/14

228

228

.555

.555

.156

.156

Stock TRIPLE DEUCE: HOLD ON TIGHT SUPER LOW- MID RANGE & RUNS LIKE HELL UP TOP!! 96 thru110 - 2006 Dyna, all 2007 2013 models
TW-555

21/41

43/19

242

242

.555

.555

.189

.178

Stock 06 Dyna & 07 thru 2013 Bolt-in Cams Ultra High Performance for your 96",103" & 110" Street or Touring bike
TW-777

22/42

44/20

244

244

.575

.575

.200

.187

Stock 06 Dyna & 07 thru 2013 Bolt-in Cams "Hot 555 on Steroids" Street or Touring bike
TW-888

23/43

43/23

246

246

.575

.575

.205

.202

Stock TW 888: Fits 06 Dyna & all 2007 thru 2013 Twin Cam engines. TRIPLE 888, HOLD ON TIGHTER!! Ripping mid thru 6,000RPM HP & TQ. BOLTIN-STOCK HEADS. TAKES NO PRISONERS
TW-999-6A

26/46

46/26

252

252

.575

.575

.230

.225

Stock 2015 – BOLT IN – SPECIAL GRIND. 96” thru 120” - FOR STOCK HEADS!!!!! FOR THOSE THAT WANT TO BE #1. AWESOME SOUND. 3,000 RPM & UP. ALSO LOVES COMPRESSION.

CVO HEADS REQUIRE MINOR VALVE WORK

TW-999-6

24/48

48/24

252

252

.590

.590

.222

.215

HI-LIFT

NEW,SUPER HOT 10.5 C/R. 96, 103, 107 & up.Head work, springs required. 50mm & up EFI TB or Carb. 135+ HP & TQ.
TW-6-6

20/40

42/18

240

240

.510

.510

.191

.173

Stock Bolt in street/touring. Very strong from idle through 5500 RPM. Light or heavy bike.
TW-7H

20/40

42/18

240

240

.575

.575

.194

.176

Stock New for 2006 – 2010 Bolt-In Super High Torque fits 96" thru110" with stock heads
TW-8-6

19/47

49/17

246

246

.590

.590

.183

.176

HI-LIFT

Best Bar Hopping - High performance cam available. Aggressive ramps - High Lift - 96 to 114 cubic inch
TW-9-6

22/50

52/20

252

252

.580

.580

.205

.187

HI LIFT

88 - 120 cu. in.+ Hot Bar Hopper - Bolt-In with S.E. Heads - Loves 3.37 Gear Ratio
TW-9B-6

22/50

52/20

252

252

.630

.630

.208

.191

HI-LIFT

The Real Twin-Cam Boss for 96 thru 124 ci – Minimum 10.5 cr
TW-9F-6

24/52

54/22

256

256

.650

.650

.220

.201

HI-LIFT

HOT-HOT-#1Knight Prowler Street cam 88 -130 cu. In. for the Real Bad Street Bike
TW10F-6

24/52

54/22

256

256

.750

.750

.225

.202

HI-LIFT

Twin Cam Chain Drive 88” thru 160” Super High Lift, Short duration Street cams for the BAD Boys. W200-1200-10l Springs required
TW-62-6

31/51

53/29

262

262

.650

.650

.249

.236

HI-LIFT

for 2012 Brutal Street Cams for the Roller Link Chains
TW-68-7

30/58

62/26

268

268

.678

.678

.260

.226

HI-LIFT

Twin Cam 95 ci Class

WINNER 2003 Daytona AMI Shootout

TW-400-6

22/42

44/20

244

244

.650

.650

.210

.190

HI-LIFT

Maximum Torque, 2000RPM & Up Bolt-In for SE Ported & 103+ Heads
TW-408-6

24/44

46/22

248

248

.650

.650

.218

.200

HI-LIFT

Hot Rod Cam for 96 thru 124 ci Stock thru 11:1 C/R
TW-408-44

24/44

46/22

248

248

.530

.530

.213

.199

Stock Hot Rod 07-13 Bolt-In - Stock Heads, Springs, Stock thru 11:1 C/R

NOTE: 216020+4 Advance Gear is available for these Roller Link Chain Drive Cams

Dave Mackie Twin-Cam Camshafts (2006 Dyna/2007 and Up)

Available for chain drive only. Gear drive recommended only with specially prepared lower ends.


PART #EVENTOPENSCLOSESTOTALTDCTOTAL DURATIONCENTERLINE 
TC510L

INTAKE

EXHAUST

18

50

42

14

.510

.510

.194

.138

240°

244°

102°

110°

Bolt-In. Stock springs OK. Excellent for 96” & 103”. Pulls hard from idle to 5500+. Likes 9.2 to 10.0 C.R.
TC575L

INTAKE

EXHAUST

26

56

42

12

.575

.575

.227

.132

248°

248°

98°

112°

Design based on the legendary TC590. It is a bolt-in for all 2007 & up. 9.2 to 10.2 C.R. Perfect for CVO 110”. Excellent 2500 to 6000+. Adjustable pushrods required.
TC598L

INTAKE

EXHAUST

24

56

50

20

.598

.598

.213

.179

254°

256°

103°

108°

Great cam set for 96+” engines with 10.25+ compression. Excellent power band. Pulls hard 2500 TO 6500+ High performance springs required.

DME Twin Cam Camshafts 1999 - 2006 (except 2006 Dyna)

TC510 and TC590 CAMSETS are available for both chain and gear drive. TC598G and TC630G are gear only.


PART #EVENTOPENSCLOSESTOTAL LIFTTDCDURATIONCENTERLINE 
TC510 & TC510G

INTAKE

EXHAUST

22

52

38

12

.510

.510

.194

.138

240°

244°

98°

110°

Bolt-in. Stock springs OK . Excellent for 88”, 95” & 103”. Pulls hard from idle to 5500+. Likes 8.8 to 9.8 C.R.
TC590 & TC590G

INTAKE

EXHAUST

26

56

42

12

.590

.590

.231

.143

248°

248°

98°

112°

This cam set will transform an 88, 95 or 103-inch motor into an animal from 2500 to 6000+. No case modification necessary. High performance springs required.
TC598G

INTAKE

EXHAUST

24

56

50

20

.598

.598

.213

.179

254°

256°

103°

108°

Great cam set for 95”+ engines with 10.25+ compression.Excellent power band. Pulls hard 2500 to 6500+ High performance springs required.
TC630G

INTAKE

EXHAUST

24

60

58

22

.630

.630

.217

.198

262°

262°

107°

109°

High lift version of the incredible TC590. Best choice for big inch and/or high compression 95”. 10.5 or higher C.R. High performance springs required.

RECOMMENDED APPLICATIONS FOR S&S CAMS 1984-1999 EVO

508: Bolt-in cam intended for stock engines with less than 10:1 compression ratio. Quiet valvetrain with excellent low/mid range torque for touring and 2 up riding.

510V: Bolt-in cam that works well with stock or ported heads. Improved ramp design results in low valve train noise. Meant for engines up to 96" and 10:1 compression ratio. 3000-5000 rpm.

520: A replacement part for S&S emissions certified engines, this is a short duration emissions cam with very little overlap to reduce emissions of unburned hydrocarbons. Requires high lift springs and normal clearance checks. 1000-4500 rpm (80"-96").

543: A replacement cam for newer S&S 4-1/8" bore V-series emissions certified engines for OE and custom applications. High lift, short duration and no overlap. Requires high lift springs and normal clearance checks. 1000-4000 rpm (111"-124").

546: A replacement cam for older S&S V-Series emissions certified engines, this is a short duration emissions cam with very little overlap to reduce emissions of unburned hydrocarbons. Requires high lift springs and normal clearance checks. 1000-4000 rpm (111"-124").

561: For 80"–96" engines at 9.5:1–10.5:1 compression ratio. Provides strong midrange power. 3000-5500 rpm.

585V: A versatile cam for 80" to 96" engines with 10:1-10.5:1 compression, and larger engines with 9.5:1-10:1 compression ratios. 3500-6000 rpm.

600: An exceptional cam in any large displacement engine with 9.5:1 to 10.5:1 compression. 3500-6000 rpm.

631: For high rpm applications, an excellent choice for all street and racing engines with 11:1 and higher compression ratios. Great performance cam, but expect more "wear and tear" on valve train components. Valve spring spacing and other normal clearancing checks required. 4500-6500 rpm

640: For large displacement motors with compression ratios of 10.5 - 11.5:1, or smaller motors with 11:1-12:1 compression ratio. Does not require as much compression as the 631 and provides a more linear power delivery. 3000-6000 rpm.

675: Designed for use with S&S special application cylinder heads, but can be used with other cylinder heads with appropriate valve springs. Intended for large displacement competition engines of 120 cubic inches or more, and 11:1 or greater compression. 4500-6500 rpm.

 


Specs for S&S® Gear Drive Camshafts for 1984-1999 Big Twins
Cam NameValve Timing Open/CloseValve DurationValve LiftCenter LineLift @ TDC
IntakeExhaustIntakeExhaustIntakeExhaustIntakeExhaust
Open BTDC/Close ABDCOpen BBDC/Close ATDC
508 11°/25° 50°/5° 217° 235° .508" 97˚ 112.5˚ .141" .110"
510V 20°/38° 52°/20° 238° 252° .510" 99° 106° .187" .178"
520 0°/40° 50°/2° 220° 232° .520" 110° 114° .086" .094"
543* Front -26°/52° 49°/-1° 206° 228° .543" 129˚ 115˚ .017" .083"
543* Rear -25°/44° 33°/-10° 199° 203° .543" 124.5˚ 111.5˚ .018" .053"
546 5°/55° 52°/5° 240° 237° .546" 115° 113.5° .126" .106"
561 32°/40° 50°/26° 252° 256° .561" 94° 102° .252" .210"
585 20°/45° 60°/20° 245° 260° .585" 102.5° 110° .186" .180"
600 20°/55° 60°/20° 255° 260° .600" 107.5° 110° .192" .184"
631 34°/61° 66°/29° 275° 275° .630" 103.5° 108.5° .281" .221"
640 25°/60° 65°/20° 265° 265° .640" 107.5° 112.5° .222" .192"
675 25°/64° 70°/25° 269° 275° .675" 109.5° 112.5° .235" .209"
*Emissions cams front and rear do not have identical timing. Negative values are due to special timing for reduced emissions.

Notes: S&S can do a special order cam. Contact your S&S Customer Service Representative for more information.
Not legal for sale or use on CA or EPA pollution controlled motorcycles.