I have 4 used cmi etops with no tails. They have roughly 275hrs of salt water use. They came off a 502 and will fit most bbc 454, 502 etc. I have pressure tested these and no leaks. I have not run them personally they can with a boat I purchased. Any questions please text 732 754 0194. Exhaust is sold as is. No refunds. NO PM. Thanks mike