Help with cyl bore

IF you have the split block engine and it is a 4.250 bore the most economical thing is to put the 336 blocks and pistons on it.
 
It is also common to see them bored to 4 3/8.
336 blocks are 4 5/8. Depends if you want to use U blocks or find 336 blocks.
I have a set of U blocks bored to 4 3/8 and a set of 4 3/8 pistons w/wrist pins but no rings or rods. Your U rods would work. These parts came off a running U and there is nothing wrong with them. I put 336 blocks on mine and bored to 4.81. I would be interested in selling.
 
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