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Old 08-19-2010, 12:35 PM
turbolover turbolover is offline
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Originally Posted by Dirty Biker
I think it would get better gas mileage at 4300 rpm at 75-80 mph going down the expressway on flat land than a a 383 or 400 or 454, and would hold up better at that sustained rpm. I travel alot, I drive to Florida, North Carolina, Tennesee, New Mexico, Montana. I need a motor built for 4000+ rpm all day long in this current truck anyway.
And this false assumption is part of why your idea won't work.

A 400sbc making 75hp at 2000 RPM will be operating more efficiently (consuming less fuel) than a 300sbc making 75hp operating at 2700 RPM.
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