Thanks for the 'heads' up. I've got a running hypothesis that so far the cracks allow the one-way passage of combustion gases into the coolant chambers, but not the other way around -- no oil in coolant, or coolant in oil yet. That's not to say that it couldn't happen tomorrow though.

I really need to do a compression test (note to self: buy diesel comp. tester), and yes, I will eventually need to replace the cyl. head. arrrgh!

Are there any potential hazards I should be aware of when I order the seals and attempt the R&R? I'm a bit nervous about messing around with the IP.