I recently lifted my 87 suburban 3" in the rear and 2" in the front. I did it with blocks all the way around. I know everyone says front blocks can pop out cornering, but let me describe my blocks and then tell me how they could possible come out. I built the blocks out of 2" x 6" 1/4 inch thick steel tubing on end. I then cut 1/4 inch steel plates and welded them to the top and bottom of the block. I drilled holes in the corners of the plates for the u bolts to go through. There is NO WAY these could ever come out while cornering, except for the u bolts snaping. The block just plain can't come out. Why are front block such a no no if done this way?