FivepointOH, in my '66 with the C-4 and 3.25 axle, I run 3000 at 70 mph and I do this all the time and have for 4-5 yrs. now. It won't hurt it. I do use Mobil 1 and have since 3000 miles after the engine was built. I don't thik 3000 sustained cruise will hurt anything as long as all the running gear is in top shape. Didn't over heat did it?
Rev
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'66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph
1/4 mi.
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