These shims go beneath the spring, Within the cap. The cap’s aluminum plus the shims keep it from galling, along with setting the pump pressure. Nisan intended the engine extensively to compete and suit throughout the FIA laws for Team A racing. The bore and stroke are 86mm x 73. https://lukasjalfl.fireblogz.com/60526778/the-definitive-guide-to-nissan-rb26dett-for-sale