Valve lash compensation

yellow rose calls it and I agree
one other advantage of chevy rockers is that the pushrod cup is also further away from the shaft lessening pushrod interference- especially with over 1.5 rockers
If this was a race motor I'd have fewer threads- longer pushrod- but it's not
looks better than any other roller rocker setup I have ever seen without shaft spacers
congrats
drive it for awhile
report your compression
cheers