This 352 engine block was prepped to have a final bore of 4.050 (stock 390 bore). It is factory drilled for hydraulic lifters. I have been told you can bore this block to 4.13(428 bore). Great block I just dont have any plans for it. I greased all of the bores and finished surfaces to keep it from rusting. I do have some nice bare cylinder heads from the 60s that I could sell if interested and new engine mounts.