So it seems that my lower unit locked up. I was out checking out the boat because of a previous issue. I had it up and rolling pretty good. Then I came off the throttle and things siezed up.
i just pulled the plugs and I didn’t see anything odd. I then dropped the lower and the motor turned over freely. I the did a cold compression check and all six were consistent and even. So I think the motor may be ok.
Of of course this means that my lower is in need of attention. I do run a coned and pinned lower.
The question is are the parts still available to rebuild these older units? This is assuming that the case is still serviceable.