This probably won't work and leave out the attachment, but I it does... here is a table off engine codes used by Mr Ford. Its the first two digits on the number which should let you find out the age of your bonk. It's been retyped from a table Scott McCloy sent me and I think its accurate but no promises!
Rescued attachment retyped codes.gif

oh look at that it did work, mental size!

That table is printed in the Burton Power catalogue, which every man should have in the littlest room

As you've guessed I don't have that.

I usually steer clear of such wallet empting temptation...

If you regester on burtons website they send you it for free every year

(and you can download it)

ooohhhh shhuddddder