That appears to be a 56 or 57, Are the decals painted on if so itsa 56 if there a plastic puck itsa 57. if ya can give me the numbers off of a freeze plug in the powerhead I can narrow it down. Those bigtwins are great old motors, just very thirsty. I know them upside down backwards and forwards. My buddy and I have about 20 between the two of us. If you need more info PM me and ill shoot you my number
Gary
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