4 X GM ACTIVE FUEL MANAGEMENT AFM VALVE LIFTER GUIDE TO SUIT HOLDEN COMMODORE VE VF VZ L76 L77 6L V8These lifter guides come with side grooves that accommodate lifters from turning on the lobe of your camshaft. These genuine GM engine lifter guide trays are the only option to consider when replacing the factory guide trays. Being a genuine GM component, these valve lifter guides provide the same performance, durability and service life. These AFM valve lifter guides suit Holden Commodores and similar platforms fitted with L76 and L77 V8 engines.