Putting in new rocker arm shafts on a 1954 Chevy 235 motor. New shafts are from Jim Carters Truck parts. Noticed that the old shafts have a 1/2" diameter hole that runs the length of the shaft. The new ones only have a 3/8" diameter hole which is the same size as the bolts that hold the whole rocker arm assembly to the head. The oil is pumped into the center of the shafts and is distributed to the rocker arms, but it would seem that the oil will not be able to go past the 3/8" diameter bolts and fill the inside of the entire shafts as it should. Anyone else run into this issue? I guess I assumed these new shafts would be made like the old ones, they need a larger diameter hole in them to let oil go past the bolts. Any comments are welcome.

Thanks, Tom