124 Twin Cam Thumper Kit
The 124” Twin Cam Thumper kit is the premier high output Twin Cam build from T-Man Performance. This head is machined to change the valve angles, allowing us to run a larger intake and exhaust valve without having to sink them deeper into the chamber to clear higher TDC lifts. The intake port is welded so we can raise both the floor and the top side of the port, increasing both flow and velocity. We use a set of 4.125” ductile iron liners paired with a set of our custom pistons. Our pistons are fully skirt coated with premier Total Seal rings. Gas ported rings can be used to help with high compression motors. When using one of our performance cams we have exceeded 150+ HP and comparable TQ on pump gas street bikes. Due to the water jackets, the Thumper Program is only available on the air-cooled heads.