- The piston is 87mm, which is 1mm greater as opposed to regular 86mm, and the fabric is light-weight and powerful A4032 solid aluminum alloy. The required clearance of 0. HKS has also created a new camshaft place sensor using a flush anodized mount, giving the engine a signature seem. https://nissan-rb26-engine-for-sa90999.ezblogz.com/59895925/5-simple-statements-about-nissan-skyline-engines-explained