Hi, I am new to this forum so bear with me. I recently bought an old Pitts special biplane. It has a 66 inch wing span. I was piloted by Charles Hillard and ran in world class championships in the late 60's and on through the 70's. I am trying to identify the original manufacturer and modifier of the engine. I want to sell it but I don't know how to describe it. Perhaps you can help me with this. I think the head is a Sachs 3.2 because it has the lettering 44 Zn 18 on the casing. Other numbers on the casing are OB, ++, V, and W2. The rest of the engine and prop mount I have not seen while searching the internet. The crank case is machined aluminum two piece with a flat plat on one end to mount the base and six bolt prop mount on the prop side. It does not look like the same material as the head. There is also a base mount shaped something like a wire spool to bolt the engine to the firewall. This is an older engine with a fiber block type ignition advance, a Bennett exhaust and a Welbro carburetor that is only marked with a DO next to the fuel inlet. The ignition block is a CD ignition made by CH Electronics Inc. in Riverton, WY. There is no prop. Could you please let me know if you can identify the original maker? It seems to have excellent compression and was recently run for a few minutes. Would it be hard to find parts for and is it worth restoring to flight or would I be better off looking for a newer engine?

Thank You. Peter