Numbers here:
http://members.shaw.ca/corvette.84/crossfire.html
Pictures here:
http://users.swko.net/~lionsden/crossfire.htm
About halfway in is a comparison of the manifold "blocked" (on the right) and "unblocked" (on the left). Look at the unblocked one. The runner drops away quickly from the port. Appears that block really couldn't extend much into the manifold given the sharp taper down.
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