Valve Spring Height Micrometer V8 A valve spring height micrometer is a specialized tool used to measure the exact installed height of valve springs in a cylinder head. The installed height is the distance between the spring seat and the retainer when the valve is closed. This measurement is critical to ensure correct spring pressure, avoid coil bind, and to select the correct valve springs during engine builds and performance tuning. Features: Convenient measurement: Fast and accurate measurement of installed valve spring heights, suitable for a wide range of V8 engine applications. Simulated seat pressure : By expanding the tool until it locks the valve, keepers and retainer in place, you can simulate actual seat pressure for extremely accurate readings. High accuracy : Measuring range from 1.600 inches to 2.1 inches with impressive precision, making it ideal for all critical engine applications. Robust construction: Made from durable carbon steel with a black finish for long service