No its standard bore, it was never rebuilt back in the day. The fella I got it off of pulled it from a wreced car in 88-89, but he cant remember what it came out of. All off the walls look good except one that had a damn rats nest inside it. You know what happens when rats make a nest inside something :angryfir:. It just looks a little pitted up to me. No deep gouges or anything like that. It might clean up with a good hot tanking & honeing. Im going out to the shop to get the VIN now. Wish me luck...its 106* here today!