The original manifold was for use with distillate fuel, therefore the intake runner was surrounded by the exhaust chamber which warmed the incoming fuel/air mixture. The gasoline (cold) manifold isolated the intake runner and so doesn't warm the fuel/air mix as the all-fuel manifold did. If you are using gasoline only, the cold manifold would probably help some, and maybe with the spluttering you mention. The cold manifold came about when Deere offered the horsepower upgrade for G's when 70's came out. Along with the manifold, the block was usually bored .125 over and higher compression aluminum pistons were installed. Original G's were rated at 39 HP, and after the upgrade, many dyno'd over 50 Hp.
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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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