VALVE SPRING TOOL for LS1 LS2 LS3 LS6Precision CNC Machined Great alternative to the higher priced tools and does the same job Designed to be used with or without the heads on the engine. You can use a pneumatic air fitting to put compressed air in the cylinder to hold the valves closed while using. Warning: Always use Eye protection when changing Valve springs Buyer will receive an item the same as shown