V8 7.4 Liter Delco Tune Up Kit M74DELCO Tune Up Kit for Pre Vortec 7.4 L engines using Delco Electronic ignition systems. V8 7.4 Liter Delco Tune Up Kit For Mercruiser 7.4 liter 454 cu. in. engines with Delco ignition systems Everything needed for a tune up in one convenient kit Kit includes 8 NGK BR6FS spark plugs, plug wires, distributor cap, rotor, 18-7844 fuel filter, 18-7824 oil filter and 8 oz. StarTron gasoline additive