Magnum Heads
I am running those same manifolds on my MP R/T heads and I had to get some plates cut to run them. The material around the port on the head was too small to seal the port in the manifold. I've seen OEM Magnum heads where there wouldn't be an issue, but I've also seen one's with the same configuration as my aftermarket ones that would be an issue. Just an FYI and warning.
