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If it is always warm where you live, use the aluminum manifold.
If it gets VERY cold where you live, the cast arn combination manifold will give you prompter driveability
when it is really cold and will also reduce use of the choke.
My suspicion is that because of the low conductivity of cast arn, operations at full throttle will be very little
affected by air heating, especially since vaporization of the gasoline cools the air.
On the other hand, warmer air in cold weather helps a LOT.
--
George Downs, Bartlesville, Heart of the USA!
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