The blocks are the same length,the water pumps are different in length.Follow the advice on the adapter plate and use the appropriate water pump(belt width)there is a lot of information on the subject,do a search.I have a 1956 235 passenger car engine with hydraulic lifters in my suburban.Here is a link to my water pump adapter plate installation. water pump adapter plate conversion


Tim


1951 3100 Chevrolet
1951 Chevrolet Suburban Carryall
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