RE: Heater valve Q

["Randall" <tr3driver@comcast.net>]

> Can anyone tell me the Tap size and thread type for the heater valve
> that threads into the the top of the cylinder head (low port TR2). I
> know the valve itself is tapered, the threads in my head are a little
> ragged half way down and I would like to run a tap through it before
> fitting the valve.

The type is definitely NPT, but I don't recall offhand if the size is 3/8" NPT
or 1/2" NPT.  I think maybe it's 3/8".

Randall