Not mine. The price seems a little ambitious given it looks to be an older build but maybe someone could use thus engine? https://www.kijiji.ca/v-engines-and-engine-parts/hamilton/buick-455-kenne-bell/1580287625
Scares me when I see an engine left with openings exposed. Probably best to tear it down if spending that kind of cash.
I think he means the oil passages are already the larger 5/8" not the 1/2" and not necessarily all the oil mods are done.
