> * Do I replace the nut with another brass one from Moss
> etc? Another supplier
> * Do I replace the nut with a standard steel ( stainless one? )?
> * Do I replace all of the nuts, now suspect of the
> strength of the rest of the 60yr old nuts?
Are they all brass? If so, I would replace all of them with original type
tall steel nuts (TRF 56675); along with new split lock washers and a
generous dab of anti-seize on the threads. (I like the copper-based
variety.)
While it's apart, take time to chase the threads on the studs and inspect
for damage. If your thread chaser binds or starts peeling metal from one
side of the threads, replace that stud.
I also have found that it helps to add a heavy flat washer (aka setup
washer) on the outermost studs (the ones that don't have bridge pieces),
between the lock washer and manifold.
Recheck nuts for tightness after first heat cycle, again at 500 miles, and
at normal tune-up intervals. Eventually they will settle down, but keep
checking until they are always tight.
-- Randall
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