36MX4 Engine numbers

[Raybrown]

Hi I have 2 engines with the following numbers I've had both rebored and balanced ready to rebuild.
I think I bought the second one a few years ago online, the first was with the complete bike still have gearbox bought another restored engine and gearbox for bike to complete restoration from Gary Greeves 246
GPB1 299
GPB 2/3/486
can anybody help
Rgds
Ray

[John macleod]

Someone on here will give you the exact details of when it was made but from my limited knowledge

GPB1 is a 36MX4 according to the 1968 spec sheet 70,

I'm guessing GBP2/3/486 is a 360 too as GPC1 is the 24MX4

Anyone else ?

Gary Gwillam said if you get in touch with him he'll help

[Colin Sparrow]

GPB1 299 is the engine from 36MX4C 507

I can't see GPB2/3/486 or anything like it in the records - possibly an export?

[druid]

The GPB/2 engine was the same as the GPB1 except it had a wide ratio SP1 gearbox

Druid