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Old 10-24-2001, 08:09 AM
mbdoc mbdoc is offline
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
The 1973 280's were made to run on leaded hi-octane fuel. I'm sure that timing, fuel mixture & engine condition all are factors in engine temperature. If your engine runs cooler with preminum then you should stay with that.
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