Dimensions for PCV hole in FE Manifold

[Tom Cimino]

I just purchased an Elelbrock manifold for my FE and need to machine the hole and counterbore for the PCV basket at the rear of the manifold. Can anyone tell me the diameter of the hole and counterbore and the depth of the counterbore?

[elmariachi]

I have a '66 2x4 medium riser on my bench. Using my digital caliper the hole is 2.00" in diameter and the counterbore in 2.40" in diameter (I would add a little bit to that to be safe, maybe 2.45".) Unfortuntately, the caliper head is too big for me to get it into the hole to read the counterbore thickness. I would suggest you measure the thickness of the basket and use that as a counterbore estimate.

[Tom Cimino]

Thanks for the info. I learned from another source that the counter bore is 2.40 X 0.055 deep.