Thread: Sleeve block back to standard bore, what do you think?

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I wouldn't. One or two sleeves in a block is usually no problem, but when you sleeve the whole block your diminishing the structural integrity. The cylinders are anchored at the top and bottom of the block, the rest is water jacket. So, when you bore the block to add a sleeve your thinning out the original material that holds it all together. Small block Chevy blocks aren't the strongest in the world to start with and putting in eight sleeves would really reduce the strength.

Just my opinion.

How would filling the block with block rock , would this help hold it together? Not filling for racing just a 1/4" fill??