COMP Cams Lifter Bore Grooving Tool .842" Diameter H777C08 Plugs provide a location to

Plugs provide a location to bleed air from cooling system of most GM LS engines

a ruler can measure distance with a good degree of accuracy

Camaro 1969

Manifold Mount

COMP Cams Lifter Bore Grooving Tool .842" Diameter H777C08 Plugs provide a location toDeveloped by one of the top NASCAR engine builders, this innovative tool precisely grooves the lifter bore to ensure the pressure fed oil is directly injected into the contact area between lifter and camshaft. This increased oiling significantly reduces wear on the camshaft and lifters and decreases the risk of premature failure during break in. This machine operations to the block is quick, easy, inexpensive and is the best insurance for a new cam