Stud Boss Cutter Tool

The PROFORM Stud Boss Cutter Tool (SKU PFM67568) is a specialized cutting instrument designed for precision engine machine work, particularly when modifying or servicing rocker arm assemblies on high-performance and stock engine builds. As a mechanic working with both street and race applications, you'll recognize this as an essential tool for cleanly removing or resizing rocker arm stud bosses without damaging the surrounding aluminum or iron casting. This cutter eliminates the need for costly machine shop trips when you need to modify stud boss dimensions for custom valve train configurations or repair work.

Engineered from durable steel construction, the Stud Boss Cutter Tool features a 0.365-inch pilot diameter that centers the cutter precisely on the stud boss, ensuring concentric cuts every pass. The 1.150-inch outer diameter (OD) cutting edge removes material at an aggressive yet controllable rate, while the 0.330-inch inner diameter (ID) defines the finished bore or pocket size after cutting. This three-dimensional geometry allows mechanics to work with tight tolerances—critical when you're fitting custom studs, inserts, or adapters into OEM or modified cylinder heads. The compact 4.95 x 1.75 x 6.8-inch form factor fits easily in your tool chest, and at just 0.32 pounds, it's ready for the workbench or engine stand.

This tool is indispensable for performance builders, vintage engine restorers, and shops tackling LS conversions, stroker builds, or cylinder head modifications. Whether you're upgrading to adjustable rocker arms, installing stud girdles, or repairing stripped bosses on aluminum heads, the Stud Boss Cutter Tool delivers repeatability and precision in a single operation. Use it in a drill press or lathe at moderate speeds with appropriate cutting fluid for best results on cast iron and aluminum cylinder heads. Professionals who regularly modify valve train geometry or repair customer cores will find this PROFORM tool pays for itself within the first few jobs.