2.2mm, 7.9mm or 8.2mm Stroker Crankshaft Spacer for 54mm stud A-Case Cylinder Stud Spacing which is the motor we sell and most common.
Use the 2.2mm for the NCY 2.2 or 2.5 stroker crank and 7.9 or 8.2mm for 8.2 crank. Remember you have head and base gaskets as well. 7.9mm used for higher compression on 8.2mm cranks. MADE FROM 6061 BILLET ALUMINUM. MADE IN THE USA