70duster 360 gets hotter the faster i go

barty005 said

Id pull the w/p seen many over the years from people using just water weak coolant mixes or just plain old stuff and the pump impellers have rotted away sure it'll move some water/coolant but no where as well as it should. you can always refit it if it's ok.

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The water pump could be going bad. But yes, running water without the proper additive like a water wetter will force the WP to fail early. But I believe he just put this engine together and has less than 500 miles on it. For all he knows, it could have air in the system! Might need to burp the system