12. Kicking open the valves are COMP Cams Ultra Pro Magnum 1.7:1 roller rocker arms (PN 630-16). With the cold valve lash set at .022 inch on the intake side and .024 inch on the exhaust side, Aschtgen installed a Trick Flow girdle kit (PN 517000701) onto the rocker studs to assist in stabilizing the valvetrain. (Note that we used .100-inch-tall Manley lash caps so the rockers would clear our retainers at almost .800-inch lift.) The two-piece girdles simply fit around the studs, then bolt together using Allen head bolts. The 7,000 rpm our 454 will turn is modest by today’s standards, but at $190, the stud girdles still provide some cheap insurance.