Besides vendors like Mopar Performance, Mancini, Hughes, etc., are there any manufacturers that have OEM sized Magnum intake & exhaust valves in stock and/or in slightly longer lengths? Or any other common applications that could be cut down? Custom valves may be too much. Just checking to see if there are any other reasonable options.

1.92" x 5/16" stem (8mm ?)
1.625" x 5/16" stem (8mm ?)

I have set of used titanium 1.60s if your interested..cheap. They'll need to be shortened a bit.
I've used MP before and IMO they're a pretty good valve for the money.

Thanks, but that wouldn't be legal for my application. I'm looking into a legal combo for IHRA Stock crate motor and the valves have to have OEM head and stem diameters as well as being steel. If available, a slightly longer valve might help with valve spring selection for the pressures I want to run. But I'd have to see how that would affect rocker arm geometry too. If it gets to be too complicated, I'll just stick with OEM lengths and look into other extra spring installed height options as well as who has the best prices.