For most applications, using our Drill & Tap fixture, anyone with a hand held drill motor can drill 8, 1/4" holes into the block between the intake and exhaust lifter bores.  The directions supplied, show how the fixture is also used to tap the holes for a 5/16" stud.  The course end of the studs supplied, are coated with Loc-tite and "double-nut" tightened into the block.  The secured studs are the anchors to hold the guide bar in place which are resting on top of the lifter bosses.