Dear Engineers,

brace yourselves. I know that cylinder head is filthy, I do apologise.

I can't wait to find out what went wrong with it, if it was indeed a valve guide and if it was on the exhaust side of cylinder 1 as I suspect.

More importantly, I can't wait to get this thing back and bolt it down on the bike. I know the boys will do a fantastic job and that (provided I fit it correctly) the Norton will run better than ever.

Incidentally, that weight reading (17.5lbs / 7.94kg) is for the complete cylinder head and all components and valve covers (plus packing).