As some of you guys on here know already, I am, albeit very slowly, putting together a HiPo 836 SOHC engine for a serious race project.
I have what appear to be a set of sandcast cylinders as they have much thicker fins and parallelogram shaped orifaces either side of the cam chain tunnel, (on the crankcase face). All the non machined surfaces are also rough to look at, (but not actually too rough to the touch).
I got these to modify somewhat, but I don't need them to be sandcast ones if that is what they actually are! A set of early die-cast ones will be okay so long as they do not have the large counterbored holes on the cylinder head mating surface, (which cut into the liners).
So can anyone better informed than me on here give me some advice as to the rareity of these (or otherwise) please? Were they only fitted to the first 7414 bikes, or are they quite common?
Picture shows both different early types of cylinder without oil way counterbores, (top one is definitely die cast!). Also shown is a close-up on the ones I suspect to be the very early type.
Nick Oldfield