[304065]

Well, the number of holes in the spray bar changed over time-- the number of holes was increased for the 1967 model year, by three- one more hole per cylinder.

Here is the description of the original holes: In the camshaft housings are aluminum tubes with holes, three of which are approximately 3 mm (0.12 in.) dia. through which the oil flows to the camshaft bearings. Six holes of approximately 1 mm (0. 04 in.) dia. , splash oil on the cam lobes. The remaining three holes allow oil to splash against the inlet valve cover in such a manner that it will drip down on the rocker arm and valve stems.

If you had a true centerlube cam box, not only is there no spray bar, there are no threaded bosses for the oil feed banjo bolt on one end, and plug on the other. The rib just continues down to the end of the box and terminates.

Walt, I don't have Dave's correlation chart handy, but the first spraybar engine is 903070, which is a late 1965 calendar year change during the 1966 model year.