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yes, 56 was a 30hp. May or may not be different…Hard to know without the proper parts book. And, this issue is clouded further because there was an oring in place when he pulled it apart….
Yes, someone may have had the engine apart and accidentally installed the oring on the upper bearing. The 1957 book shows the oring being used… At this point, we don’t know what year engine he is working on… I just don’t want him to reassemble the powerhead without the oring if indeed one is called for. And, just as importantly, I don’t want him to add the oring if it is not supposed to be used on his engine…. Either case will result in an oil mag plate and having to pull the crankcase apart again….