How to measure a late B engine block bore size

Anonymous-0

Well-known Member
I have a John Deere B block. Casting Number B2500R. Im not sure if its standard bore, or oversize. I didn't get pistons with it. What is the measurements for a standard bore, .045 over, .090 over, or .125 over. I have a digital calipers but it only goes as far as the inside and outside edges. Any help and measurement numbers are appreciated.
 

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