S&S Cycle 99-05 BT Super Stock 89cc Cylinder Head Kit - Black Wrinkle

Starting with the 89cc combustion chamber, these S&S Cycle Super Stock cylinder heads are built for 1999-2005 Harley-Davidson Big Twin engines. This chamber size offers a compression ratio that's a bit higher than stock, making them a solid choice for larger displacement engines, including stroker or big bore builds up to 110 cubic inches, and they're particularly well-suited for touring bikes and other heavier vehicles where that extra torque matters.

The design incorporates large 2.000-inch intake valves and 1.605-inch exhaust valves. This setup helps maintain good port velocity for responsive low and midrange performance, while still allowing enough airflow for larger engines to reach their full potential. The included high-performance valve springs are rated to handle camshafts with up to .650 inches of lift. For comparison, the intake ports on these heads flow 264 cfm, a notable improvement over the stock heads' 182 cfm, which translates to better breathing for your engine.

These heads are designed to work with your stock rocker boxes, exhaust, and intake manifolds, simplifying installation. The black wrinkle powder coat finish is a nice touch, matching the look of stock black engine components. This kit is a well-built option for those looking to enhance the performance of their Big Twin.