I have a set of Schoenfeld jet boat headers for small block chevy engines. These are the 1-5/8" stepped to 1-3/4" primary tubes. They are new with less than 20 minutes of run time but that did cook off the black paint they normally get shipped with so you would want to get them ceramic coated or painted for protection. There is a small single hole in the bottom of each collector where I bolted the Patriot muffler inserts into them. I also have a pair of Schoenfeld muffler inserts which I will include for the package price. $250 for just the headers or $290 for the headers with the 4 muffler inserts. I have the header bolts that came with the headers as well and the gaskets might be reusable. I ran these on a 350 Chevy with no problems. These headers could also work well on custom car or truck setups and hot rods. (6O9)5 tree O-968l.
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Update: I went ahead and painted the headers to make sure there that no rust gets started.