VANGUARD ENGINE REFRESH KIT – Includes (2) standard 75.5mm piston ring sets with 3-piece oil rings, complete gasket set with seals, spark plugs, (2) oil filters, fuel filter, and 4oz Lucas engine assembly lube. FITS 38 CUBIC INCH VANGUARD V-TWIN ENGINES (75.5MM BORE) – Designed for Vanguard 18HP, 20HP, 23HP, 25HP, and 27HP OHV V-Twin engines using a standard 75.5mm bore.⚠ Do NOT select by horsepower alone — verify engine model number. REPLACES OEM PART NUMBERS – Piston Rings: 843806, 808528 (75.5mm STD, Qty 2) Gasket Set: 841188, 808390, 847319, 842722, 808704 Oil Filters: 492932S (Qty 2) Fuel Filter: 493629S Spark Plugs: NGK (replaces Champion RC12YC) HIGH-QUALITY COMPONENTS – Piston rings and gasket set are NOT made in Taiwan or China, ensuring consistent tolerances, durability, and reliable sealing for engine refresh applications. ENGINE ASSEMBLY LUBE INCLUDED – Professional semi-synthetic assembly lube with zinc, moly, and high-pressure additives to protect bearings, cams, lifters, and valve train during startup and break-in. This Vanguard V-Twin Engine Refresh Kit is designed for 38 cubic inch OHV engines that use a standard 75.5mm bore. It is ideal for engines with good cylinder walls and pistons that need new piston rings, fresh gaskets, and routine service components to restore compression and performance. The kit includes two standard 75.5mm piston ring sets with 3-piece oil rings, a complete gasket set with seals, spark plugs, oil and fuel filters, and Lucas professional engine assembly lube. Each component is selected to meet or exceed OEM replacement specifications for Vanguard V-Twin engines. ⚠ IMPORTANT FITMENT NOTICE: This kit is for standard bore 75.5mm engines only. Always verify your engine Model, Type, and Code number before ordering. Do not rely on horsepower alone when selecting parts. The included Lucas Assembly Lube is engineered for engine refresh and break-in work. Its advanced formula helps prevent dry starts, galling, scuffing, and premature wear during initial startup. Compatible with 38 CID Vanguard V-Twin OHV engines, including (but not limited to): 384445, 384447, 385442, 385445, 385447, 385777, 386442, 386447, 386777, 389445, 389447, 389575, 38E347, 381447, and others. Ideal for commercial mowers, generators, and heavy-duty equipment powered by Vanguard V-Twin engines.