Douglas,
It's the head that determines the plug. The threaded portion is either
approx 1/2 inch or 3/4 inch. You can measure that with sufficient
accuracy by using a wire with a hook at the end.
Some time has passed since I installed new plugs, so I am not up to
date on current numbers. I suspect, though, that if you identified your
TD as "early" or "late" the parts counterman could find the right plug
for you.
Bob
On Tue, 13 Jul 2004 12:53:41 +1200 "Douglas Ormrod"
<douglas.ormrod@neurological.org.nz> writes:
> Hi T folk
>
> The TD spark plug changed form 1/2" to 3/4" reach at engine 22734 -
> mine is earlier than this. My original MG head was bent and cracked so
I
> have replaced it with a good Wolseley one of unknown age. It has been
> mildly worked - ported, bit of a plane, hardened valve seats and new
> improved performance cam. So my question is what plugs should I use -
is it
> the head that determines choice - and can I find out without taking it
off!
>
> Thanks
>
> Douglas
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