Empi 90.5mm / 92mm Cylinder Shims, .060 Set Sold As Set of 4 CYlINDER SHIM SETSSteel shims allow for adjusting deck height without machining the pistons. Corrects for increase in stroke and compensates when case is surface machined. Clearanced for standard 8mm studs. Sold in sets of 4.These shims have been clearanced for 8mm and 10mm studs.90.5mm, 92mm21-7068 - Cylinder Shim Kit, Set Of 4, .060"