I have seen a few P-600s go over the 'bay and have yet to see one with the Rochester bolt pattern. They are relatively rare. For those who think that Weiand is still making the 2-4s for the Poly, get real. I wish that they were still making the 7503, but that's been gone a year. I don't have a catalog old enough to show tthe Weiand 2-4 manifold. Offenhauser AFAIK never made an intake for the Plymouth Poly. They might have made intakes for Chrysler or Dodge Polys but not for the one that turned into the 318.

They are a good engine but the two problems that I talked about in an earlier postt are still there.

R.