Additional copies were produced to equip high-end versions of the Corvette, bringing the total production to 71.

Early testing and development took place at the Shadow racing team facility in Marina, CA, near Monterey.

Although a turboprop has a superb power-to-weight ratio, it has high fuel consumption, and its performance drops off linearly with altitude.

The OE600 offered better fuel economy, as well as considerably improved climb rates (even though it was heavier) and cruise speeds, all suggesting a lower overall cost of operation.

Several new aircraft were designed around the engine as well, including the TAI ZIU, Hongdu N-5, LZ-400 Rhino and the Lancair Tigress.

At the time they offered a supplemental type certificate conversion for the Otter, planning to follow this with the King Air.

The design was later purchased by a group of investors who intended to sell the engine under the Texas Recip brand.

More recently the project has been picked up by TRACE Engines of Midland, Texas, and is certified by the Federal Aviation Administration.