164 3lt head water pipe thread

[ARQ164 Shane]

Hi Guys,
I'm just replacing the old heater pipe outlet that threaded
into the head.
I made a bit of a mess of the old pipe dose anyone
know what thread is of that pipe please?

Cheers
Shane

[ARQ164 Shane]

So guys we have been taking about this on alfabb and what sizes it could be
and this is what  we came up with and it fits:
Page 272 - RYCO Catalogue,3/4 1.5/16 -1221 S90-1221

[stustustu123]

Good work - handy to know for future reference (hope I never have to deal with it though!).