That would depend on the condition of your M38's engine and ignition system. It is simply a move to a slightly hotter plug which is often done just to reduce fouling of the 2243's caused by high oil consumption. The hotter plug will do a better job of burning off the oil deposits from it's tip.
Using too cold of a plug results in fouling of the plug and using too hot of a plug can result in spark knock or pre-ignition. That is why the engine and ignition system's condition will determine how the engine performs with the hotter plug. _________________ Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100
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