The powerplant is a horizontally opposed Lycoming six-cylinder design.

The cylinders have steel barrels with aluminum heads, and the valves are operated by hydraulic lifters.

The crankshaft is supported in an aluminum-alloy split case by four main bearings and one ball-thrust bearing, and lubricating oil is supplied from a 12 quart wet sump.

The accessory housing supports two magnetos, a starter, a generator, and a dual tach drive.

There are also numerous engine suffixes, denoting different accessories such as different manufacturers' carburetors, or different magnetos.