Super C blocks

Hello I am redoing a super c with a bad block and I have been looking for a new block. I have found a few. My question is what is the difference between the casting numbers 354898R1, R2, and R3?
Thanks
Ryan
 
You need to check the bore at the bottom where the sleeve fits. Later blocks would take a 3 1/4 sleeve ourside of that the blocks will interchange. If you are going with new sleeves be sure to measure the bore at the bottom as you wouldnt be the first to get sleeves that wont fit.
 
The R1, R2, R3 indicates MINOR revisions to the design of the block.

A block with a higher R-number is a backwards-compatible replacement for previous R-numbers.
 

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