Product Description Specifications Evolution Big Twin 1340, Compression: 10:1, Displacement: 1340cc, Bore: 3.528"/+.030, Stroke: 4.250", Domed, +12.9cc CARB: This product is not CARB Legal and not for sale in California Category: Engine Components>Piston Sets - Powersports Core: N LTL: N MPN: K0216P3 Proposition 65: N Special Order: Y