I didn't recore the old radiator because the only shop around wanted 600.00 plus to fix the original. I bought the used one from Carters that had supposedly been checked out and pressure checked for around a buck and a half, well the rest is history. I know I should of had it flow cheecked. As far as a new one?, I had a difficult enough time tring to find a decent used one for a 46 COE.