044 10mm or 12mm

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SST73

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How do you tell if your o44 is a 10 mm or a 12 mm.
I have two 044s and would like to identify them.
 
Measure the wrist pin if it's tore down, if not I believe the 10mm is before a certain serial number and 12mm is after a certain serial number. Not exactly sure on the serial number though. Maybe a search on here would turn up those serial numbers
 
There is a noticable difference between the two in both sound and performance. If ported I am sure it would negate that. Brad is right about a 12mm bottom as it is stronger.
 
Will any 044/440 jug fit an any 044/440?

What's the deal with the angled finned D shaped combustion chamber? Is it actually better?

What are they worth/how much do you think you can buy one for?
 

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