lve job must maintain valve centerline and guide angle in OEM stock location in relationship to the head.No air directional devices on any valve surface.3.4 Rocker ArmsOnly steel or aluminum Roller Rocker arms will be permitted.3.5 Pistons, Rods, Cams, CrankshaftSolid Steel connecting rods required, no titanium, aluminum, stainless steel or other material allowed in or on connecting rods.Only alum