S&S Cycle 84-99 BT Performance Replacement Low Compression 82cc Cylinder Heads - Wrinkle Black

These S&S Cycle Performance Replacement cylinder heads are built for 1986 through 1999 Harley-Davidson Evolution big twin engines. They are designed to work with stock-style flat-topped pistons and feature an 82cc combustion chamber, which is slightly larger than stock. This size helps create a manageable compression ratio, making them a great choice for larger displacement builds where you want improved performance without excessive compression. In fact, these are the same heads S&S uses as original equipment on their own V96 and V80 engines.

You'll notice larger valves than stock: 1.900 inches for the intake and 1.575 inches for the exhaust. These bigger valves help move more air into and out of the cylinders, but the port design is still tuned to maintain good air velocity. This means you get strong performance not just at high RPMs, but also in the low and midrange, which is where you spend most of your riding time. The included high-lift valve springs are rated for cams up to .585 inches of lift, giving you flexibility if you decide to upgrade your camshafts down the road. They are designed to fit with your stock intake manifolds, exhaust systems, and even the temperature sensors on EFI models, simplifying installation.

The wrinkle black powder coat finish gives these heads a distinctive look that stands out. They are a well-built component that can make a notable difference in how your engine performs, especially when paired with other upgrades for larger displacement applications. If you're looking to improve the breathing and power of your Evolution big twin, these heads are a solid option.