Yea well I only got the 1256cc engine yesterday, and all day today I thought about exactly what is this engine, so when I got home I cleared a space on the bench and lifted the engine onto it. After stripping off all the odds and sods, I managed to start looking at the engine is closer detail. I took off the head and found the biggest valves I have seen in a OHV head, they are so close together they are almost overlapping. The bores being nice and clean with 60 thou oversized pistons.
Below is a 1159 head I rebuilt last year one can see the huge difference in valve sizes, to the head above.
Tomorrow I shall attempt to get the sump off and have a good look at the bottom end… Happy days deep in engines again.