HOLD DOWN KIT, TAPPET GUIDE, DRILL & TAP TO INSTALL, DRILL & TAP INCLUDED. Without this stakedown kit installed the exhaust-side valve tappet guides will come out and get beaten up by the cam. This will ultimately cause serious and expensive damage to your cylinder head. Both exhaust and intakeshould be done. This kit includes 6 plates and 12 bolts, enough to do both intake and exhaust. (NBM0001)