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04-07-2018, 11:33 PM
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#12 |
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60-66 Nut
  Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,251
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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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