Long valves on W2's with .600 lift?

Well Jim...Turns out the 5.165 exhaust valve I have here (bought for a sample) will work. Manley put a thicker margin on the valve but it really is close to the 5.140 I need from the tip to the valve face.

My buddy's $30,000 R3-blocked, Brodix spec head WISSOTA engine uses the samle size valve. 5.140 intake/5.165 exhaust. These sell for around $21.00 each so they are affordable.

I got a heads up from a member on ST then spoke with my friend who sez that sounded right.

So the mystery may be solved.