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Complete Powerhead Rebuild Kit for Mercury & Mariner 75-90hp 3 Cylinder Bigfoot Outboards, 1994 & Up, OEM Cylinder Bore Size 3.500". For engines that use Top Guided Connecting Rods. Casting number on your connecting rod #646-818846. Includes: 3 Pistons, 3 Piston ring sets, 3 Wrist-pins with circlips, 3 Wrist-pin bearings, 1 Upper main bearing, 2 Center main bearing, 1 Lower main bearing, 3 Connecting rod bearings, 1 Powerhead gasket set with seals, 6 connecting rod bolts. Handling time 1-3 Business Days. Questions about this item? Call TSM Performance at 847-526-6211