i have a set of stockers that have never ever been used in at least 20 years. i actually have the whole engine out of a low mile gn that was wrecked in 1991-1992 my guess is probably only 20,000 miles on them obviously never welded or cracked or repairs of any kind. lots of life still in these. i have plans for the engine but could live without the headers.i just figured you might be looking for a lower dollar option that you may not of considered. this engine came with the trooper t cop car that i posted pics of back in febuary in the lounge