What type/ year are these heat exchangers

[bobt4945]

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 advance

[gs_subsea]

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

[30westrob]

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

[Jack Stands]

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.