Piston Kit - Big Bore - 81mm
XS Performance 1st. oversize (81mm.) Forged Big Bore Piston Kit.Piston includes ring set for 1 piston, piston pin(1) and pin clips(2).Forged Piston features:1. - Valve pockets cut for large valves.2. - Mos2 treated piston skirts.3. - Oil channel for enhanced wrist pin oiling.4. - 20mm. piston pins that are internally tapered to ends for weight reduction.5. - Lightweight 9:1 piston assembly weight of approx. 340 Grams.Fits to - 1974-84 447 type engines with Big Bore (750cc.) cylinders.