I know there are restrictors in a 427 FE block but I just pulled the intake manifold on my 428 and found 3 ea. 1/4-20 allen head plugs laying in the lifter galley. Now I know that there are no plugs in the heads, I asked Edlebrock. I couldn't find anywhere in the intake manifold that would take the plugs, but after I put the engine back together, it would hold more than 40 pounds
oil pressure, cold. Before I took it apart it ran about 60 pounds cold. I am unaware of any
oil system plugs in the 428 block. Can anyone help?