Mopar R1 block

SwedishViking said

I am considering to have the lifte bores sleeved or not to do it. Calculating the cost vs horsepower gain would be my issue.

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Can you explain this a little further? I thought that an R block did not need bushings, or is the lifter bore height similar to a stock block? I assume you are concerned about how much lift you have and exposing the oil band?