If both those 6 L's by themselves, linkage disconnected from each other, idle down properly, I would have a hard look at the connecting linkages for play,binding when the motors are torquing etc. Those two rack are literally one when connected together, affecting both motors. If one motor seems slow to come down , disconnected by itself, I would look at ,a sticky injector, hi - low spring pack in the governor is sticking from condensation, and or a buffer screw in to far ( if those early govenors had them)
Love those old Detroit's. K Armitage
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