I think the cam may be siezed. this is tricky since it turns in unfaced aluminum. I would proceed with care about the cam. I would probably pull the cam and towers and try to free the journals one at a time.

As for the cylinders various things will help. Tranny fluid, marvel mystery oil, penetrating oil as well or better than diesel fuel. just be sure to remove plugs before trying to turn it over so the oil can be pushed out.

I would drain the motor oil and see if there is water in the bottom of the pan, probably first thing.

Good luck

Tom W

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.