The Spring Kit is a drop-in high performance spring kit for all OE LS cylinder heads and is rated for up to .600" lift. This spring kit uses all OE hardware, including seats, retainers, and locks and ...

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Elgin Industries has introduced Elgin Pro-Stock conical valve springs engineered for General Motors LS Series and Chrysler Hemi performance engines. The new Pro-Stock springs (#RV-107228Q16) feature a ...

If the cylinder heads are on the engine, you will need to add air pressure to the cylinder to hold the valves in place. Our example is the Craftsman 47089 compression test kit using the 14mm long ...