hmmm, my experience was with it bent, it wouldnt close all the way and wouldnt seal properly, hence no pressure. then i had the joy of the machine shop doing my work, and giving me my head back to me and none of the valves shut!!!!! im glad i didnt put it on the car, i wouldnt probably bent them all again, they forgot to bleed the lifters so all the valves were raised about 1/4 inch