Triumph Repair: Exhaust manifold, roadster factory, moss motors

Question
Are the exhaust manifolds from a tr4 interchangeable with a tr4a and all years of tr4's

Answer
Hi Rick,
I have never made that change and I don't have anything in print that says they are interchangeable. However as I remember the pattern of the studs and port should make either fit.
If you need to be sure you should contact one of the Triumph parts suppliers and confirm they can be switched.
The Roadster Factory or Moss Motors to name a couple.
Howard