Thanks for that info. The bike's a SuperFlash, so was originally fitted with the 365 cam and (I think) 8:1 slightly raised pistons. I got hold of it after it had been dumped on the street - the bores were out to +.060, and the crank had one grind left on it - during all these previous 'rebuilds' it seems the sludge trap was never cleared - totally blocked!! The cam is still useable and the pistons (standard A10 compression) seem to have had very few miles before the bike packed up and wad dumped. I'm completely with the philosophy of keeping the motor soft if it isn't going to be used in a sporty fashion, which, after thinking about it, has ruled out going with the Robbins jobbies. Thrashing around in today's traffic on a plunger framed BSA isn't really feasible and the country roads round here would be just as deadly! After owning the beast for ~40 years I'm finally doing something about putting it back together. The scariest bit is the price and availabilty of fasteners, chroming, etc. I've just bought two stainless bolts w/nuts that, after VAT & postage, have cost nearly 4 times what I paid for the bike (the equivalent of a tenner!) Can't find stand spigots anywhere - on order with Draganfly. The plan is to put it together as I would have wanted it back in the day - not as it came out of the factory. So it'll be a red & chrome tank, alli rims, etc. The originality cops can take a hike.