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Old 09-01-2013, 12:13 AM   #58
disston
ShadeTreeExpert
 
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Joined: Mar 2011
Location: Silver Spring, Md
Oddometer: 8,986
I believe the difference is in the counter weights. Some counter weights were larger, maybe they are heavier. Yes the stroke is all the same. But the counter weights also interfere with actually getting the cranks in and out of the blocks.

I've only been searching the Snowbum site for half an hour. I'm only through the first article of the "Engine" section. I'll find it before morning if I don't fall asleep.
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