I still can't believe I'm really only getting 26" MAP in climb though, because I'm turning close to 6200 rpm at 120 mph.  Since that's the same as what you were seeing, I find it pretty hard to imagine that I'm getting as much power as you had, but with 4" less MAP.  I sure hope I'm wrong though :-)

Rusty;

Maybe you’re comparing apples and cherimoyas.  Measuring MAP at the downstream end of the TB “runners” is different than measuring out in the air plenum before any losses.  It is difficult to believe there is 4” drop, but until we have some other measurements, we don’t know for sure.  On my dyno runs I also measured 26” at 6200 WOT.

On another issue, since adding damping volume with clear vinyl tubing in the MAP sensor line, I am finding that there is some fuel accumulating at a low point in the line.  I find this very strange since the MAP ports are on the side walls of the TB barrels, but since the ports are downstream from the injectors, there must be some fuel migrating along the walls and getting into the ports.  What is the orientation of your TB – MAP line coming off the top of the TB or off the bottom? If coming off the bottom (as mine is) you may want to pull off your MAP line and see if there is any fuel in there.

Al