This listing is for an engine rebuild kit compatible replacements for Chevrolet GM marine 3.0L 181ci L-4 standard rotation engines with a 1-piece rear seal. These engines are commonly used in Mercury Marine, OMC, and various other marine applications. This kit comes with rod bearing width of .842, Some late models use a .713 wide. Please determine rod bearing with before ordering.This kit contains the following top quality parts: Piston Ring Set, Rod bearings set (need to know if rod bearing width is .713 or .842), Main bearing set, Cam Bearing Sets, Marine Engine Gasket Set ( This gasket set contains all gaskets needed for engine re-assembly but may not have all accessory manifold cooling gaskets. Buyer may need to contact their local marine dealer for these miscellaneous gaskets.) Timing Gear Set (w/ Aluminum Cam Gear) & Oil Pump.