Engine Locked Up

[vince1]

I know it seems like a remote possibility but I actually cracked a Mercedes 6 cyl aluminum head with shop air of 185 psi in the cylinder when doing a valve seal change. The welder at work fixed it and the machinist took it down with a flat file. In that shop the compressor ran almost continuously. After that I changed all their leaking fittings and brought it back to about 150 psi.

If the seized piston is half way up your chances should be good. Even if not then using the one with a piston close to 1/2 way up should turn the crank.

Good luck with it. Even after you get it running there is nothing stopping you from putting in the bigger engine. 230 is a little small.