Thanks for the reply.

One of the main reasons I initiated the thread is for the same reason you bring up. I know I am assuming the worst and was just searching for any other explanation other than what I know it is.

Your advice regarding the water pump is a good one and I'll give the motor a thorough going over before I make the determination to pull the heads.

It seems to leak even before the motor gets very hot so if water is coming from somewhere else and draining back to the rear of the motor then it should be visible.

Thanks again.