We were ready to line-bore the case. Jason said that we probably could have gotten away with the 0.020in. that was already done, but not wanting to take a chance, I had him run the 0.040in. line boring bar through it. Some say to never line bore a case, just buy a new one; some say don't ever line bore a case past 0.080in. You will have to decide what works best for you and your budget. I personally feel comfortable on a low-compression, low-revving engine with 0.040in.