These .921 diameter lifters are for the 1966-1967 Oldsmobile 400. They are made in America. We have all heard the horror stories about the Chinese manufactured lifters for the early Oldsmobile 400 engines. We have sold and used dozens of sets of these American made lifters without incident. Yes, they do cost more but you get what you pay for and they are much cheaper than rebuilding a brand new engine because you saved $100 or so only to have your new cam wiped flat and your engine ruined. Sold per each.