Hello all, I just recently was given a 400 sbc, it has been machined .030 over. there are still stock heads and an unknown cam in it. My question is, after I pull the heads off, what would it take to "freshen" up the bottom end if there is still a nice crosshatch on the walls? The heads will not go back on, probally going to put a set of Vortecs or something of the sort on top with a mild cam. Street driven car, no racing. Also if anyone in NJ knows a machine shop, let me know.