✓ VERIFIED
May 24, 2021
Strong torquey cams with nice idle,strong from idle to 5000+
S&S CYCLE
SKU: T14-619398
S&S Cycle MR103 Camshaft Kit - Harley 103 CID Dyna & Big-Inch Twin Cam
$3.318.000,00
Free shipping on orders $99+ · Best value guarantee
affirm
From $276.500,00/mo with Affirm.
See if you prequalify
OUT OF STOCK
Free Shipping on orders $99+
Best Value Guarantee
30-Day Returns — see policy
Authorized Dealer — sourced direct
About S&S Cycle
S&S Cycle has built American V-twin performance parts in Viola, Wisconsin since 1958 — flywheels, carburetors, cams, cylinder heads and complete crate engines. When a Harley owner talks about a 124, a 128 or a 131 build, they are usually talking about S&S. Few names carry more weight with engine builders in this space.
Elevate the performance of your Harley-Davidson with the S&S Cycle MR103 Camshaft Kit. Designed for 103 CID engines found in 2006 Dyna and 2007-2016 big-inch Twin Cam models, this camshaft kit is engineered to deliver significant power gains across the RPM band. It's an ideal bolt-in upgrade for bikes already equipped with intake and exhaust modifications.
Why riders pick this
- MR103 profile for 103 CID Harley engines
- Compatible with stock or S&S CNC ported heads
- Ideal for engines with modified intake and exhaust
- Optimized for 9.7:1 to 10.5:1 compression ratios
- Delivers strong power gains across the RPM band
The S&S Cycle MR103 camshaft kit is a serious performance upgrade for riders looking to maximize the output of their 103 cubic inch Harley engine. With a specific profile tailored for these larger displacement V-twins, the MR103 cams are designed to work optimally with compression ratios between 9.7:1 and 10.5:1. You'll experience a noticeable increase in usable torque and horsepower, with peak performance hitting between 2,500 and 5,500 RPM, making it perfect for aggressive street riding.
Optimized Performance for Modified Engines
- MR103 cam profile specifically for 103 CID engines
- Works effectively with stock or S&S CNC ported cylinder heads
- Engineered for engines with modified intake and exhaust systems
- Delivers power gains across a broad RPM range
The Next Step in Your Engine Build
Installing the S&S Cycle MR103 camshaft kit is a transformative upgrade for your Harley-Davidson Dyna or big-inch Twin Cam. While these cams are designed as a bolt-in replacement, a proper dyno tune is crucial to optimize your engine's air-fuel mixture and ignition timing, ensuring you get the most out of this performance component. Consider this cam kit if you've already upgraded your air cleaner and exhaust and are ready for the next level of power.
Specifications
- Brand: S&S Cycle
- Manufacturer Part #: 330-0303
- Category: Engine Components / Camshafts
- Weight: 6.05 lb
Common questions
Will these MR103 cams work with stock cylinder heads?
Yes, these cams are designed to work with unported stock heads, but they will deliver their best results and maximize power when paired with S&S CNC ported cylinder heads.
What compression ratio is recommended for these camshafts?
The S&S Cycle MR103 camshafts are designed to work optimally with engines that have a compression ratio ranging from 9.7:1 up to 10.5:1. If your engine falls outside this range, it's best to consult with S&S Cycle or a professional builder for compatibility.
Is a dyno tune required after installing these cams?
Yes, a professional dyno tune is highly recommended after installing any performance camshafts. This ensures proper fueling, ignition timing, and maximizes the power and reliability gains from your new S&S MR103 cams.
Ordering from Vtwinbikers
- Brand new, sourced through authorized US distribution — never used, never grey-market.
- Not sure it fits? Use Shop by Bike to filter by your year and model, or email us and we will confirm before you order.
- Harley-Davidson and Indian Motorcycle is all we do, so you are talking to people who ride what you ride.
| BRAND | S&S Cycle |
| TYPE | Camshafts |
| SKU | T14-619398 |
| WEIGHT | 6.05 lb |
Please contact us to confirm fitment for your specific motorcycle, or check the product title for compatibility notes.
CUSTOMER REVIEWS
5
5 RATINGS
5★
5
4★
0
3★
0
2★
0
1★
0
✓ VERIFIED
Jan 17, 2015
Service was excellent. Product lives up to expectation. Process was easy.
✓ VERIFIED
Jan 6, 2022
I originally ordered the andrews H48 but while waiting for my thundermax tuner to arrive, I decided I wanted a big bore kit as well my bike has always been hard to start hot and I don’t have compression release heads so I got s&s mr 103 easy start cams and an S&s 107 big bore kit. I have not had a chance to ride it yet because after 4 weeks of waiting jp informed me it was gonna be 2 more weeks before the tuner would arrive so I had to cancel my order and ordered one from Fuel Moto yesterday, I have started the bike but have not rode it yet but it starts and restarts easy the cams work great!
✓ VERIFIED
Dec 18, 2020
Only have 75 miles on them due to snowy/icy weather here, but so far I’m impressed,
✓ VERIFIED
Jul 1, 2019
The mr103 is just what I was looking for in a cam upgrade.
