Vicious power gains; wide street-able power band from a high lift profile camshaft for high performance engines with highly modified cylinder heads and compression ratio. Carburetor and or throttle body work required along with a performance exhaust and intake system. Maintains low end performance with eye blurring mid and top end power. High performance valve springs; pushrods; lifters and clutch required. RPM 2;500 - 6;900+. Note: Requires 503575 splined 34T chain driven gear for 1999 Twin Cam models; which must be purchased separately. Note: Special Order Product only. To order please contact your MCS sales representative.