Educate me please !!! LA info needed

Oh ****, look there are no ribs between the lifters! I put out the word that I needed to know WTF those ribs were hiding and now we got the answer...nothing! I bet they are put in there for cylinder rigidity. I chucked my short 'B' rollers into my 360 and they are a big 'no way' even with V link bars. The link buttons totally hit the block. The LA retro rollers must be very tall to clear that area with buttons in the rear.