I ride a 2013 blackline. There is no doubt s&s makes a quality product. But what I didn’t know at the time is the bike has stock apr (auto pressure release). That being said the stock apr’s do not fit In s&s heads. So these are not a direct swap. Solution is buying there apr kit which will cost you around $400 plus (also have to rewire it ) different rocker covers that will cost you another $1000 bucks. I got lucky and had easy start cams so I just deleted the stock apr and turned off that setting in my tuner. I have a thundermax so it was easy for me. Stock computers or different tuners might be more of a pain in the ass. <br /><br />Overall they are a quality product but imo they should change that design to allow the stock apr’s. All that extra time and money because there made the apr port larger.
S&S Cycle Cylinder Heads 91cc Wrinkle Black - Harley Dyna 2006-2012
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.
These S&S Cycle cylinder heads are designed for 2006-2012 Harley-Davidson Dyna models with 91cc engines, featuring a 4-1/8" bore and a stock bolt pattern for direct replacement. Cast in a durable wrinkle black finish, they offer precise compression and performance. Upgrade your Dyna's top end with these quality S&S Cycle components.
Why riders pick this
- 91cc displacement for enhanced engine performance
- 4-1/8" bore for optimized combustion
- Stock bolt pattern for direct, adapter-free installation
- Durable wrinkle black finish for a custom look
- Designed for 2006-2012 Harley-Davidson Dyna models
- Provides precise compression for power gains
For Dyna riders looking to enhance their engine's performance and aesthetics, these S&S Cycle cylinder heads are an excellent choice. Featuring a 91cc displacement and a 4-1/8" bore, they are engineered to provide improved combustion efficiency and power delivery for 2006-2012 Harley-Davidson Dyna models. The wrinkle black finish adds a custom look that complements many V-twin builds.
Performance and Style for Your Dyna
- 91cc displacement engineered for enhanced performance
- 4-1/8" bore diameter for optimal combustion
- Stock bolt pattern ensures direct bolt-on installation without adapters
- Durable wrinkle black finish for a custom aesthetic
- Designed for 2006-2012 Harley-Davidson Dyna engines
Building a Balanced Top End
These S&S Cycle cylinder heads are a key component for any performance-oriented Dyna build. Their direct bolt-on design simplifies the upgrade, but to fully capitalize on their potential, consider matching them with appropriate camshafts, pistons, and a performance exhaust system. A professional dyno tune will ensure your engine's air-fuel mixture and timing are perfectly optimized for these heads, maximizing your V-twin's power and reliability.
Specifications
- Brand: S&S Cycle
- Manufacturer Part #: 900-0993
- Displacement: 91cc
- Bore: 4-1/8"
- Finish: Wrinkle black
- Weight: 28.65 lb
- Category: Engine Components / Heads
Common questions
Will these S&S Cycle cylinder heads fit my 2013 or newer Harley-Davidson Dyna?
No, these cylinder heads are specifically engineered for 2006-2012 Harley-Davidson Dyna models with 91cc engines. Later model years require different head specifications.
Do I need to change my pushrods or rocker arms when installing these heads?
Compatibility of pushrods and rocker arms depends on your complete engine build and other components. It's recommended to consult with S&S Cycle or your engine builder to verify compatibility for your specific setup.
Is a custom tune required after installing these cylinder heads?
Yes, whenever upgrading engine components like cylinder heads, a custom dyno tune is highly recommended to optimize your engine's air-fuel ratio and timing for peak performance and reliability.
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 | Heads |
| SKU | T14-664035 |
| WEIGHT | 28.65 lb |
I did a 107 big bore bike ran about 235 degrees, then I installed these heads bike now runs at 275 degrees, it runs hot now, I’m installing an oil cooler, the bike goes from 0 to 60 in 3 seconds. It’s hard to hold on at full throttle my face shield presses against my face the power is unreal!
Fitment was good, but you have to rework the breather passages in order to use stock rocker boxes. Also don't forget the longer head bolts.
Drop-in replacement that exceeds OEM performance.
bought a set of these for a just completed 117" engine upgrade. They do offer better all around performance. Other than having to install a set of manual compression releases. They can be considered a true drop-in replacement. Using a set of 0.030" head gaskets will get you a calculated compression bump to ~10.7:1 from 9.2:1. They are billet and not cast.
They got here fast and they are just what I needed to finish my 110 kit.