Cylinder head to heater core tube(Thread Size)

[djtang]

Does anyone know where I can get the metal tube that mounts to the cylinder head and leads to (3/4" hose then) the heater core? If not, what are the thread sizes in the head and the reducer?

[t3rse]

Have you taken the piece to a hardware store? It is standard NPT thread (3/8 or 1/2 maybe?)

[djtang]

I know the coolant bleeder plug is NPT thread. The hole I'm talking about does not appear to be NPT... I guess I'll just keep searching.

[turbovanman²]

It's large, not sure the exact size, maybe around one inch. Do you need the pipe and nut? I have a few kicking around. FYI, its a 5/8 hose. :D

[4 l-bodies]

Pretty sure it's a 3/4" NPT.