Jims USA Standard Hydraulic Tappet - Big Twin - 2463-1

These tappets will run in cast iron or aluminum tappet blocks. Recommend fitting the tappets to the blocks with a clearance of .0007" to .0012". Produced from billet bearing steel. A true center-line for roller life and exact cam timing. State of the art pushrod seat, machined with the same segmented parabolic cup as the JIMS® roller rockers. Hand fit hydraulic unit to a running fit of .0002", with ultra precision air gauging system.