ported cylinder markings? help id them

snowfoxsx

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Joined
Feb 2, 2004
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139
Age
51
Location
winnipeg manitoba canada
i am running a set of 700 sxr ported cylinders, make unknown, unless someone knows who marks the cylinders with this mark: M1057, M1058, M1059, HELP ANYONE, i would like help to id them so i know what i have and who did them if possible! does bender or hauck mark cylinders in this way, numbers are on the intake side by the reed cage. looks like they were marked with a punch set. i could take a pic if it will help.

the transfers and intake look to be opened up a lot and the exhaust also somewhat, but the dimensions in the cylinder are not touched too much, intake transfers seem to be widened and raised slightly so i am guesing its a trail port.
 


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