Jack sees it basically as I...The port roof material was extensively removed so we devised a reinforcing method (insurance I suppose) to tie all the rocker stud bosses together. It seems to be working pretty good. However, on the thread engagement subject...even though we machined stud boss material away, we have the same amount of threads in the stud boss as Pontiac designed and installed in 1969. We used the same part number rocker stud as we use on all iron head stud girdle applications. The Crane stud mount Gold race rockers have been very reliable with no issues as has the Jomar girdle. Valve lash has remained very stable such that I have not had to adjust valve lash in two years.
Floor filling pic was early in the evolution and exceeded our velocity design for this engine so we continued grinding. The chosen parts in this old stud mount roller rocker/pushrod guideplate design are working so well a shaft system is not necessary...on second thought maybe that is what is holding the engine back...
The pic is from another angle showing the bar stock used to tie the stud bosses together.
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