When Was This Engine Made?

Hello,
When I was a small boy my Dad had a big box of bits that were the makings of a Cooper race car. This was back in the 60's. Amongst all the race car parts was a wooden crate with an engine in it. I was intrigued by the crate with Triumph stencilled on it but over the years the Cooper parts disintegrated or were sold. Like many young idiots (I was 12 or 13 I think) I took the engine out of it's wooden crate and wondered what sort of go kart I could make with it. Drew up some plans and then got distracted by an easier lawn mower project. Unfortunately the crate got lost, but I have kept the engine ever since.

I used to have a T120R back in the late 70's and always hankered after a Triton. I had an engine and gearbox, but couldn't find a Slimline Featherbed frame at the time, so that project never happened.

I don't think it has been run except on the factory test bed. I'd love to know when it was made (I'm hoping in my birth year of 1957). Here is the engine number. Could anyone tell me something about it?



I'm sorry about the yellow over spray - that was from a kart I used to race in the early 70's.

 

Thanks for the info. It looks like it was built in 1957 and that would be consistent with what my Dad said all those years ago. I think the X means that it was never fitted to a bike - it was built as a spare engine.