Need help ID ing Mcculloch motor. Mc100?

[Dean Richards]

I have search high and low for any numbers on the block and found none. No serial # tag. posted couple more pics. Looks to have casting recess for the crank bolts and recess in piston skirt for crank, no recess in exhaust port, Recessed head gasket, Right hand thread on crank with keyway, 2, finger ports opposite of exhaust, chrome flywheel cover, no 9 port or 3rd port, no transfer port cover, and not a fixed head. The bore is from 2.265-2.277 around the cylinder, and stroke is 1.835. I see from the super series chart that this appears to be a 101A/A since all others have a serial/ block number??

    I want to say Thank you to all that have helped me with this process and look forward to more input.

                                                                                Dean
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