[Dragsinger]

The news is good. I pulled the spark plugs and all look fine. Then used shop air in each cylinder checking for bubbles in the radiator, no problem.

The drained oil looks fine. Looks like simply a case of condensation. As Little Wheel suggested I will use the GM "tabs" for insurance.

Also, this is a new Dart Little M block with blind holes.

I was concerned about a pin hole in the welded head but looks like that concern was unfounded.

Thanks for the comments and suggestions.