Valve train oil passage bolts

someone mentioned that the rocker shaft on my 340 has special bolts for the oil galley that supplies oil to the shaft (second pillar back on the driver side, second pillar forward from the fire wall on the passenger side) that these bolts ( that tie down the oil shaft) are either hollow or are tapered to let the oil flow around them?
Any truth t this rumor?
If I don't have them installed, will I not get oil to the valve train?
Where would I get them if they exist?
Anybody got pictures of them?
Author: admin