Building a strong 383 stroker, actually 385 because its .040 over, but my block ended up being bad and 3 blocks in a row now had cracks or need a sleeve put in. Considering how much heat builds in the cylinders on airboat is a sleeve a good idea? Will the crack end up coming back through the sleeve, have heard of it happening in circle track cars. Will the heat transfer difference in the block with the sleeve make a difference?