are you meaning a block gaurd?if so it supposidly prevents cylinder walk to be honest though i dont think you need one seeing as stock sleeves can hold a good bit


block girdle is a brace that goes on the bottom of the block. It usually connects the crankshaft mains together so that they are less prone to move about. More crankshaft stability,to me prob for higher revs....if im not mistaken the gsr ect come with them

hope this helps..