I wonder if they are talking LS6 to LS6 - .055" milled heads need that size rod? I keep hearing that the sodium filled valves are longer. How much exactly I don't know. I also don't know if the installed height of the valve tip on the LS6 sodium filled and hollow valves is the same as non-LS6. Time to just quit worrying about it and buy some adjustable rockers.

Lance, PM me your address and I'll let you butcher up my spare rocker trays.