Billet tappet block set FR+RR BT84-99

These American made tappet blocks are machined to perfection from a block of 7075-T651 billet aluminum alloy with a tensile strength of minimum 83.000 psi., which is triple the strength the Original Equipment part. Fits Evolution Big Twin models 1984 thru 1999. Complete set front and rear (OEM 18540-83A & 18542-83A).