Trick Flow 440 heads, The Real Deal?

I ordered a mock up ( one..) Hughes rocker, ( for comparison..)to compare to the cheapo Cat small block rockers,I tried to run. The one, I bought: Cleared all the clearance issues I had on mock up, superior fasteners & machining quality.. I don't like the quality of some of Hughes products, the rockers are spot on..

are they bushed? or are they just solid aluminum bodies? is this a problem with higher spring rates required for solid roller cams?