What type/ year are these heat exchangers
 

These came with a 3.0 I bought a couple years ago. Lost my job so now I’m selling the motor, someone pm’ed me that they might be early 901 or 1964/65 911 exchangers. Surprising solid. Any insight greatly appreciated. Thanks in advancehttp://forums.pelicanparts.com/uploa...1595263280.jpg
http://forums.pelicanparts.com/uploa...1595263280.jpg
http://forums.pelicanparts.com/uploa...1595263280.jpg
http://forums.pelicanparts.com/uploa...1595263280.jpg
http://forums.pelicanparts.com/uploa...1595263280.jpg
http://forums.pelicanparts.com/uploa...1595263280.jpg

I have an identical set to these on a 1981 targa, I am also interested to find information on these.

Mine are in similar condition and have some internal rust that came out. I am wondering whether they are worth restoring, potentially ceramic coating them.

Would I be wasting money doing this?

Thanks in advance

Made by Triad industries. In Bruce Anderson’s engine book he has some HP numbers. Rob

If the actual exhaust pipes are solid, ceramic coating might certainly make them look better. I had some 914-6 heat exchangers done and they’ve held up beautifully.