- The piston is 87mm, which happens to be 1mm much larger than the typical 86mm, and the material is light-weight and powerful A4032 cast aluminum alloy. The specified clearance of 0. Awesome individuals around at jjsmotorsport. These men went over and beyond to be sure get the right replacement https://remingtonxdhhg.bloguetechno.com/rb26dett-complete-engine-fundamentals-explained-63718211