I searched and searched for a thread specific to this engine and didn't find one... So here's the start of one.

I got this engine from a guy that wasn't going to get around to replacing the old rusty bearings in it. He disassembled the engine some 20 years ago or something of that nature, stuck it in a bag and put it away. Faat forward to now... I put a new set of bearings in it and reassembled it... The only thing I wasn't sure of is which way the piston was installed originally. It had no cutouts or anything, just an arrow scratched into the top. I installed the piston so the arrow pointed at the liner locating pin and went with it. It had a decent pop to it cold, so I ran it that way. It's had a lot of use it seems - the piston seal isn't stellar, but I'm sure that will improve some as it kinda re-beds in. I got a diesel head (Davis) for dirt cheap NIP which is my intended purpose for the engine. I test ran the engine on APC props, 5% nitro 20% castor fuel, and McCoy MC59 plug.

8x6 - idle stable at 2,900 and peaked at 15,000.
9x6 - idle stable at 2,700 and peaked at 12,700.
10x6 - idle stable at 2,400 and peaked at 10,800. It didn't seem all that happy on this prop - spool up was a little slow, but it didn't sag and run hot. Probably will be the starting point for prop load on diesel. It seems like it should do a lot better than this though.. Maybe more nitro will wake it up?