- The piston is 87mm, that's 1mm bigger when compared to the normal 86mm, and the fabric is light-weight and strong A4032 forged aluminum alloy. The desired clearance of 0. is a strong engine, powering in excess of a few generations on the Skyline GT-R. The famous RB26DETT is respected https://rb26dett-complete-engine92356.blogpixi.com/28493319/rb26-engine-for-sale-can-be-fun-for-anyone