I own a 1987 YJ 258 I6 with a 4.0L head swap. I'm sending the bare block down south next week to get cleaned and magnafluxed. Is it worth my while to overbore the cylinders to gain HP? If so, how much con I overbore the cylinders by and what size pistons will I need?
AMC 258, all mods
7" SOA BF 35" mud terrain