Join Date: Sep 2019
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When I researched the problem a while ago I got the impression that it's rare for the head gasket to blow on the 675 engines. Lets hope it's only the heat exchanger on yours too.
Regarding plugging/bypassing there seem to be different opinions by different manufacturers of billet coolers. What makes most sense to me is to plug the connections, then all of the coolant flow goes through the engine. If you put a bypass tube instead of the heat exchanger a lot of the coolant flow will go there, because of less resistance, instead of through the engine block and top.