318 heads, 302 casting. Mystery holes?? (Solved!)

RustyRatRod said

That's just flat out untrue. With GOOD, STRAIGHT header flanges, GOOD header gaskets like Remflex and a GOOD set of header bolts, they will not leak.That may have been your experience with inferior parts, but not everyone has the same experience by FAR.

Click to expand...

Let me clarify my remark. My son's first truck was an '83 W150. He showed up one day with a new set of headers that sounded terrible. Inspection showed he didn't plug the AIR holes. I fixed the problem by installing a set of earlier heads that didn't have AIR holes. Problem solved.