Quote:
Originally Posted by Chief of the 60's
Besides "lugging", running with too low of RPM will cause the engine to load up and run hot. A higher RPM will allow for a cleaner burn resulting in cooler engine temperature. I have been dealing with O.D.'s in old cars for 20 years which, back then, people would say "they won't work" or "you can't do that". I have raced them as well as drove them on the street which is where I found what the sweet spot RPM is that makes everything happy.
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Then what is the point of the expense of an overdrive if you wind up in the 2600 to 2800rpm range? That is 3.42 range with a th 350 or th400? One only has to tune the engine to run extended times at lower rpms with an overdrive.
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466 Mike Voycey shortblock, 310cfm SD KRE heads, SD "OF 2.0 cam", torker 2
373 gears 3200 Continental Convertor
best et 10.679/127.5/1.533 60ft
308 gears best et 10.76/125.64/1.5471
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