Acceptable crank stud length and con-rod bolts ?

Sure don't want to open a "Pandora's box", but I really have to ask. Surely someone on this forum must know :shock: Currently I'm building the crankshaft for my 850 project, and was wondering what the allowable "stretch" is for reusing the crankshaft bolts/studs; and the connecting rod bolts ??? Everything I read tells me to use NEW con-rod nuts, OK ... I have no problem with that. (I've got new ones ordered.) But, none of my research tells me it's necessarily to install new con-rod bolts. Some even recommend reusing the old "tried and true" con-rod bolts !

I've also got several sets of used crankshaft bolt type and the later studs only type of crankshaft fasteners. Though some I would obviously not reuse ... others of them look pretty good.

Looked in every single Norton resource I have; Haynes manual, Clymer manual, Norton workshop manual, various magazine Norton articles ... even the INOA Tech Digest and I can't find a standard, or even measurements anywhere. :?: Does anyone know what the "new " length is for the crankshaft studs, and the allowable "stretch" that they are still considered useable ? How about the con-rod bolts ? If it was REALLY that critical, (and I think it is) surely I would have found an answer in at least one of my resources. Comments please :?

Don't worry too much the tried and tested methods you're reading about work very well indeed.

Cash

I treat fasteners like food. When in doubt, throw it out.