X1 and X1A serial #'s and low gears

There has been some discussion lately in the pulling forum about low gear H's with a X1A at the end of the serial number. My Dad and I are working on a '49 M right now so I decided to check and it ends with "X1". Can anyone shed some light on this?

Thanks
 
x1 alone means high compression gas engine. It is very common. x1A and x6 are the low gear codes, I think, but I have never had either and can't remember for sure.
Zach
 

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