Magnum head 6mm valve OD tolerance

Does anybody here have a factory spec for the 6mm valves used on the Magnum heads, specifically the OD tolerances, though any other specs would be useful also. I have bought a set of stainless valves and want to check them before the heads go in for rebuilding.

I have a Magnum-specific book coming, but I'd like to leave eBay feedback for the seller sooner.

TIA.

Dean.