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[vila]

Anyone familiar with the engine numbers on the TR4 factory replacement engines.

The TR4 commission numbers ran from CT1 to CT40304 and the original engine numbers are supposed to be within a few hundred of the commission numbers.

Then the TR4A commission numbers ran from CTC50001 up to CTC78684 and their engine numbers seem to have started around CT50xxxE.

My 1962 TR4 commission number CT7771L has an engine with a number starting with 47 (i.e.  CT47xxxE). I thought the engine came out of another TR4 earlier in its life, but original engines should have ended with a high CT40,xxxE number.

Do I actually have a factory replacement engine?

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[charley fitch]

Logic tells me that engine number 47,000 would not have been "created/built " until about 1965 or so.  Have you obtained a British Heritage Certificate to determine what the engine number was for your car, according to Triumph? 
I understand that the engines were numbered as they were built.  So any engine that was used for some other car or was found to be unsound would account for the difference in numbers from the commission number to your engine number.  But if a engine were defective they would have just pulled the next one from the line to put in that car.

You do have an interesting question in that there were no cars produced in the 47000 range.  So why would they have made engines in that number series.

Most of our cars have had an interesting past and  what is on the cars at present is often not what they started with.  After a few decades even a replacement part comes to look very original.  On my TR3 I was convinced that the carpets were original until I finally was able to determine that the carpet set I had was no where close to what was original to the car.
Charley Fitch