I'm looking at buying an m115 engine and I'd like to ask about it as I'm not intimately familiar with it. Mainly where the model number is stamped on the engine and/or how to tell the difference in specific versions? What the compression should be? Also if there are any specific things I should look out for on them?

This is a fake post, a direct copy of this:

M115 buying help

Funny how the older thread also went nowhere, and was posted by another new account.