Chain drive. .574" int. .574" exh. Replacement cams for use in combination with the stock mechanical chain tensioner system. Compatible with stock length pushrods. Bolt-in for 96/103/110". All-round performance cam with smooth cam lobes performance pushrods & lifters recommended but not required. 99-04 TC 88/95 require high lift valve springs. Responds well to head modifications & higher compression ratios. 99-06 Twin Cam (excl. 2006 Dyna) (NU)