Technical Early Oldsmobile Rocker Shaft Differences

Good evening fellas, I'm in the rebuild phase of an early Oldsmobile 303...it will be outfitted with a pair of 324 heads with Isky adjustable rockers and here lies the question....

While tearing down the rocker ***embly I noticed one of the shafts is slightly grooved from wear. So I sourced an NOS shaft which came in the original GM packing etc...however the slots and diameter of holes are smaller than the stock shafts that are on the motor and than those the adj rockers were on.

The diameter and length of the NOS shaft matches the others which came off the motor and match the shafts the Isky rockers were on....

Due to the nature of the sensitive top end oiling system of these motors, I'd like to make sure either the NOS is an acceptable replacement or if I should hunt for replacements to match the worn pair.

Has anyone else come across the different relieves patterns before....diagonal vs straight?

....Thoughts?

 

I've seen at least three different variations of rocker shaft oiling holes and grooves on 303/324 shafts. No doubt that the O.E.M. shafts had a design change or two, and then there were several aftermarket companies that made them.

 

You could always drill out the holes to match the used ones.

 

That's the plan...wanted to see if the angled slotted shaft was for 57-62 and if so if that matters...