Authentic GM Marine longblock engines manufactured on GM production lines strictly for marine use. Available in both standard and counter rotations in multiple displacements. Serves as the base for all Marine Power engines.

Our base engines are the ideal replacement for your engine if the existing components are still good and can be reused. With the ability to be configured and built up to match any application, our base engines offer ultimate flexibility.

GM Authenticity, outstanding performance, variety, and versatility make our marine base engines the premium longblock replacement option.