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Discussion Starter · #1 ·
I own a 1987 YJ 258 I6 with a 4.0L head swap. I'm sending the bare block sout next week to get cleaned and magnafluxed. Is it worth my while to overbore the cylinders to gain HP? If so, how much can I overbore the cylinders by and what size pistons will I need?
Cheers
 
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