Thread: Cooling problem
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Old 04-07-2018, 11:33 PM   #12
Captainfab
60-66 Nut

 
Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,246
Re: Cooling problem

Running SBC400 heads on a 350 block will not cause any cooling issues. It has always been my understanding that a cooling issue when driving is related to a coolant flow restriction. Does your lower hose have the coil spring inside? If not that hose could be collapsing at higher RPM's restricting coolant flow.
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