Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - 350 sbc running hot on highway
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Old 06-25-2010, 09:27 AM
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I would guess 1 of 4 issues listed in order of probability

1, Too little air flow through radiator or it is undersized.
2, Internal cooling system pressure holding thermostat closed.
3, Radiator hose sucking shut at highway speed.
4, Ignition timing retarded
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