Regis Manufacturing Grinding Stone

Regis Manufacturing Grinding Stones: Precision Abrasives for Serious Engine Work

When it comes to engine rebuilding and machining, few tasks demand more consistency and precision than resurfacing flywheels and valve seats. Regis Manufacturing has been meeting that challenge with purpose-built grinding stones since 1959 — making them one of the longest-standing names in the engine building supply industry.

A Legacy Built on the Engine Building Trade

Based in Dallas, Texas, Regis Manufacturing has spent decades supplying professional engine builders, machine shops, and automotive manufacturers with the abrasive tools they need to do the job right. Since their founding in 1959, the company has focused specifically on the needs of the engine rebuilding trade, and that focused expertise is evident in the design and performance of their grinding stones.

Flywheel Grinding Stones

One of Regis Manufacturing's most recognized product lines is their flywheel grinding stones. Flywheels are typically cast iron components that, over time, can become warped, out of balance, or develop an uneven friction surface. Resurfacing with the correct grinding stone restores the flywheel's original geometry and ensures proper clutch engagement and engine balance.

Regis offers flywheel grinding stones in multiple configurations — including general purpose, cast iron, steel, and heavy-duty variants — so engine machinists can match the abrasive to the specific material and finish requirements of the job. Their K-series stones (such as the K-1056, K-1057, and K-1059) span a range of diameter, height, and arbor combinations to fit popular flywheel grinder machine setups.

Valve Seat Grinding Stones

Regis Manufacturing's valve seat grinding stones are engineered for use with Sioux-style valve seat grinders, one of the most common platforms found in professional engine shops. These stones are designed for both roughing and finishing operations on most valve seats, and are available at common angles including 45 degrees. Regis valve seat stones are built to be long-lasting, fast cutting, and capable of delivering a satisfactory finished surface — qualities that matter when reconditioning heads at volume.

Why Engine Builders Choose Regis Grinding Stones

• Decades of specialty focus: Regis has served the engine building industry exclusively since 1959, giving them deep knowledge of what machine shops actually need.
• Application-specific formulations: Stones are offered in general purpose, cast iron, and heavy-duty grades to suit different base materials and machining conditions.
• Broad fitment range: Multiple size configurations ensure compatibility with a wide variety of flywheel grinders and valve seat grinding equipment.
• Consistent performance: Designed to deliver repeatable cut rates and surface finishes across the full life of the stone.

Whether you're reconditioning a single passenger car flywheel or processing cylinder heads in a high-volume rebuild shop, Regis Manufacturing's grinding stones are purpose-made for the task. Browse the full selection of grinding stones available here, or explore the complete Regis Manufacturing catalog to find all the engine building tools and supplies they offer.