318 overhaul

RustyRatRod said

One last thing, I believe one rocker shaft bolt on each side has a smaller shoulder in order to let the oil through into the shafts. You'll want to make sure those go back into the correct shaft stand holes. You can easily see which they are as they have an extra space around the bolt hole. Easy to identify.

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Close but not quite..... The gap for oil flow from the head is from the shaft's hole sizing, not any bolt size variation, and the oil flows in around the threaded end and shank of the bolt. On some shafts, the 2nd and 4th holes of the 5 holes are enlarged for this purpose. On other shafts, ALL of the holes are enlarged; seems like Chrysler did it a couple of ways. Why? I cannot say....