Michael Edwards - Just a suggestion: since you will be using antifreeze for the first time and the block has been raw water cooled forever, it is probable a lot of crud has accumulated in the bottom of the block jacket. First prize would be to remove the side plate for a complete clean out. Failing that try putting a (temporary) cheap,say Jabsco, filter in line just before your new electric antifreeze pump. What collects in the plastic bowl will tell the tale. Hanley
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