Sealed Power Main Bearing - Standard - Small Block Chevy 4663M RK-GMR25 Since the first start up

Since the first start up of a new engine is critical to its life expectancy

Works with 2-Cycle oil blends as high as 20:1

Spring-Loaded Bullet 1-1/2 O

The runners have been ported to improve velocity and evacuate the cylinders

Sealed Power Main Bearing - Standard - Small Block Chevy 4663M RK-GMR25 Since the first start upProduct Description: Main Bearing Standard Small Block Chevy Sealed Power engine products are application engineered components, including pistons, piston rings, engine bearings, oil pumps and lifters. These proven replacement parts are the result of product development efforts, dedicated to putting only the absolute best on the street. Our engineers design and validate the engine parts to accommodate repowering engines due to wear. By leveraging this