Lifter Bore Grooving Tool .842in Diameter

The Lifter Bore Grooving Tool .842in Diameter by COMP CAMS is a specialized machine shop tool engineered for serious engine builders and mechanics performing precision cylinder head work. This tool exists to solve a critical problem: lifter bores in aluminum and cast-iron heads require controlled, accurate grooving to restore worn surfaces, improve oil flow, and ensure proper lifter sealing without compromising bore integrity. Whether you're rebuilding a high-performance engine, restoring a vintage block, or servicing competition heads, this tool delivers the precision needed for professional-grade lifter bore restoration.

Designed with a .842-inch diameter specification, the grooving tool matches OEM lifter bore standards and cuts controlled grooves that enhance oil distribution while maintaining tight tolerances essential for hydraulic lifter function. The tool's geometry and sizing allow technicians to restore lifter bores that have experienced wear from thousands of miles of operation, creating uniform surface patterns that promote consistent oil film formation across the lifter face. This dimensional precision prevents over-cutting that could compromise bore wall thickness and eliminates the risk of lifter rattle or oil starvation caused by inadequate groove depth.

Professional engine builders and machine shops rely on this tool for any lifter bore restoration project—from street engine rebuilds to full race applications where oil flow and lifter stability are non-negotiable. The tool integrates seamlessly into standard boring bar setups and CNC equipment used in automotive machine shops, making it accessible for both small independent shops and high-volume rebuilders. Installation and use require proper boring equipment and shop experience with precision machining; this is an essential tool for anyone serious about restoring cylinder head integrity and ensuring long-term engine reliability.