I just had a look with the torch but couldn't see one but I seem to remember that it did. Before this I had a HP six in my previous car so I think I would remember if it didn't have 253 on the side. What's the difference... ? I was told that only the early ones had the Eng. No. beginning with 253 by another guy who was into such things.
The guy I bought it off was strict about numbers, I took him to mean that it was definitely an original Monaro motor. He had it in a HJ four door GTS and he had a HT Monaro with a 350 in the shed which he told me was not a factory 350.
He later told me (early to mid nineties) that he had sold the HT. That is why I ask. He is probably well known here or a past and/or present member of this site.
I have no idea if the motor came out of that HT. He was buying and selling alot of cars and parts back then, but it could do. It was a fairly low mileage motor he said and it looked and felt like it. Did they have the Engine No. on the tags back then... ?
It's a great motor, I'm not in a hurry to sell it. But I would sell it to the guy/girl who now has the car it came from, if it still exists, without hesitation.
I just thought the number should be on some kind of register.