Proper location for rocker shaft 'Screw-Locating'

[twas_brillig]

The rocker shaft design incorporates a single set-screw to prevent the shaft from moving fore & aft; the parts manual shows it threaded into the rocker pedestal at one end of the shaft. The rocker shaft assembly I was going to install has it (and the appropriately threaded pedestal) located second from the end. I've got a couple of other engines; the most accessible has it in the end location.
I don't see how the location makes a difference, but would appreciate others' thoughts on this.
Thanks
Doug

 

[twas_brillig]

Just checked another engine, and it has the locating screw located second pedestal in from the from the front of the engine. Thoughts still appreciated. Doug

 

[Gerard]

What you need to check is where the oil feed is on the head (under pedestal 1 or 2). Some heads have the oil feed at cylinder #1, some are #2.

(These pedestals are damaged- shown only to demonstrate location of oil feed.)

Oil feed on these heads (1275) is at position #1

 

[twas_brillig]

Thanks Gerard - makes sense. The head is off getting the valve guides sleeved, hardened valve inserts, etc., so will be a couple of weeks before I can compare. DOug