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Old 07-18-2010, 08:10 PM
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I haven't used an Air Gap yet and maybe never will if I don't build any more motors, but it makes sense to me that if you can separate the hot oil splashed onto the bottom of the manifold from the intake mixture, you would get a denser charge into the heads. Anyway, my vote is RPM Air Gap. You're already penalized for driving in cold weather with the L31 heads which have no heat crossover, so I don't see where it will matter much if you have cold air running under the intake. Just let the motor warm up to operating temp in colder weather and the thermostat will handle it from there.
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