S&S Cycle 84-99 BT 83cc Cylinder Head Kit For S&S 4in Bore - Natural Aluminum Finish

If you're looking to get more performance out of your 1984-'99 Harley-Davidson Evolution Big Twin engine, especially one already set up with S&S 4-inch bore cylinders, this S&S Cycle Super Stock cylinder head kit is a solid choice. These heads are built to be a direct replacement for your stock heads, but with significant upgrades to help your engine breathe better and make more power. The 83cc combustion chamber is shaped like a modified bathtub and is designed to work best with flat-topped pistons, which is common in performance builds.

What really makes these heads stand out is their airflow potential. They come with large 2.000-inch intake valves and 1.605-inch exhaust valves, paired with ports that are designed to flow a lot of air. This means your engine can take in more fuel and air mixture, which is crucial for big-inch engines that need to make serious power. They're also built to handle cams with lifts up to .650 inches, giving you flexibility when choosing other engine components. The heads are machined to the S&S 4-inch cylinder stud pattern, ensuring a proper fit with compatible S&S cylinders, but remember they are not designed for stock crankcases.

This kit comes with a natural aluminum finish, giving your engine a clean, classic look. It's important to note that these heads are not CARB approved and cannot be shipped to California. If you're building a high-performance V-Twin, these S&S Cycle heads are a well-built component that can help you achieve your power goals.