Part Number: 11-0421 UOM: 1 - KIT Summary:Piston set 3-5/16" bore is .060 oversize. Set includes ring set, 2 wrist pins and 4 circlips. Pistons have a steel expansion control strut cast. For 74" engine Fitment: UL 1937-1948 Tech. Notes:11-2543 - 74" Side Valve Piston Ring Set .060 OversizeCountry of Origin: Imported