This listing is for an engine re-ring kit compatible replacements for Chevrolet 250ci 6-cylinder marine engines. P/N 915-100. Consisting of Piston Ring set, Rod and Main Bearings and a ( FEL-PRO or Victor) Full Gaskets set.( We have included images of the gaskets for your reference). In the marine industry, this engine is commonly referred to as a 160HP or 165HP series engine. This is a Standard/Stock Size Kit. Oversize Pistons, Rings, Rods and Mains are available at no extra cost. Please email or call with specific sizes needed or otherwise your kit will ship with Standard Sizes.