Profile: Grant Piston Rings, Inc. is a manufacturer of quality piston ring sets for passenger cars, light trucks, industrial engines, air brake compressors and motorcycles. Our pistons are high quality cast pistons using either eutectic or hypereutectic material. We provide pistons and rings. Our pistons designed as direct replacements for OEM pistons. We supply rings for automotive, light truck, compressors, generators and stationary engines. We manufacture the highest quality rings for unmatched engine performance.