That passage goes way up in the block towards the passengers side....you need to keep at it until you get the coathanger (or something a little heavier) to go up inside the block about 12 inches. Once you break the crud loose in this passage, you'll be amazed at all the solid stuff that has collected up in the back of the water jacket.

Chemicals aren't really going to help you much....just keep at the passage. I pulled the freeze plug right above the petcock and used a hose nozzle to flush out the stuff. Might not work if your manifolds are on.

You might consider using distilled water when you recharge the colling system. I refer a 25/75 mix....25% antifreeze....and the distilled water will coast you less than $2.00. Pretty cheap insurance against overheating.

Dave


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