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Might be missing something here cos i can't remember .................blocking those heater hose outlets won't allow any water to flow through block & heads until thermostat opens , this is the reason for the 'loop' , fine to plug em off if you don't run a thermostat (or drill stat)........block temps will be a lot higher than temps @ water pump neck , with no water flowing through block & heads heads 'hot spots' will cause block scaling & worse still can crack when thermostat opens.



I don't know if that's true or not, but where does the water flow? it's not going through the radiator, so even then, when the thermostat opens, you'll still get a rush of cold water from the radiator flowing into the block and heads.

**Photobucket sucks**