BCompetition Cams 5003 Lifter Bore Grooving Tool, .842" Diameter ReviewbP PP Competition Cams 5003 Lifter Bore Grooving Tool, .842" Diameter P.842 inch Diameter for Standard ChevroletPComplete with grooving tool, cutter and handlePCarbide cutter available separatelyPEngine must be disassembled to use this toolPCuts groove from .009 inch to .