[72cs20]

Bomp ,you got that right.

Cleaning, cleaning and more cleaning and then painting, painting and painting.

Well, I figured I'd try and back flush the engine through the t-stat housing port in the cylinder head. This approach seemed to work well and I got four or five 5 gallon buckets of nasty rusty water before it started running clear. It all came gushing out of the water pump port in the block. I think this will be as good as it is gets short of re-building the engine.

Here is a pic of some of the water that came out and a pic of probably the 7th 5 gallon flush. And one pic of the cleaned t-stat and water pump mounting surfaces

Now it was time to put everything back together.