Twin Port Top End Engine Rebuild Kit 1600cc For 1300cc to 1600cc Engines. The kit includes cylinder heads, 85.5mm barrels and pistons, pushrod tubes, engine gasket kit, main oil seal, 009 distributor and spark plugs. This kit can be fitted to earlier 1300-1600cc singleport engines. The inlet manifold and carburettor will need to be replaced with a twinport version.