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The 100-Six Forum

Engine Block Casting Number

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59AH100-6 Jon Bill
Auburn, IN, USA   USA
I have a 1959 100-6 BN6. The I. D. plate on the engine has been removed by a previous owner. Cast into the left side of the block is the code "20 M 7". Does anyone know what this means? Is it a date code? Thanks!

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