If you are talking about the 6 start LH special nut that holds the half time pinion on the crankshaft then i was advised by Mick Hemmings just to fit it with a drop of Loctite an tighten it up. There is no stated torque figure and being a LH thread it is not inclined to work loose he added he has never had an issue with them so just tighten them with a suitable spanner till your happy its done up.
Mick Hemmings says 15 lbs/ft for cam sprocket nut on the chilled iron PW3 cam and a spot of Loctite as hi torque can shear the end off the shaft. I have not read the Old Britts website myself (being in England there are more local suppliers) but if i where you i would reread it just to make sure of such a high figure on the cam nut. As for the crank 6 start LH nut i have never seen a figure for it in any manual or website.
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