- The piston is 87mm, which can be 1mm larger in comparison to the normal 86mm, and the fabric is lightweight and robust A4032 solid aluminum alloy. The required clearance of 0. The RB25 crank collar concern is actually very common on numerous RB motors, such as the RB20DET and https://stephenkhljn.review-blogger.com/50647098/the-5-second-trick-for-nissan-skyline-rb26