The bolt you are talking about...it's limited to hydraulic engines only...right? Your "wanted post" had me go look at the bolt in my rocker shaft. Mine is a 3/8X16X3" straight shank bolt. My engine is a solid lifter engine.
Norm
Well.......sorta. I am finding out that sometime in the late 1970s even the solid lifter engines got the bolt as well, to help keep from installing the rocker shaft upside down and or backwards. Makes sense.
