Bill & Stan,
With the speed the engine was overheating, I knew I had serious blockages.
So I did use it straight out of the bottle, but only for this time.
I hope I did not cause too much internal damage. All I know is the exhaust would only spurt out a little water every 5 seconds and now it has a heavy spurt every 5 seconds with a smaller one between. Water is flowing like a brand new engine. I'll have to cross my fingers!
Now I know the jackets are clean and will maintain them with the recommended maintenance. I plan on doing the power flush this Spring.
During the diagnosis of the overheating problem, I started installing the MMI alarm kit and snapped of the nipple for the oil pressure sensor. It came out with an easy-out, but I do not want to touch any more fittings until next year
Got to get a few more sails in this year.
I wouldn't recommend anyone using the acid straight but this was an extreme case. This motor sat idle with no maintenance for 4-5 years.
Thanks again for all the advice,
Chief