1.550 Dual Valve Springs

PAC Racing Springs Model 1325-16 is a severe duty valve spring designed for solid roller style valvetrain. It is ideal for most aftermarket cylinder heads with 1.550" diameter dual springs and camshafts with up to 0.850" lift. The 1300 Series springs feature additional surface finish enhancements and are engineered for more demanding applications compared to the 1200 series. These springs are optimized for aggressive valvetrains and high lift, abusive applications. Key specifications include an outside diameter of 1.550", an inner spring ID of 0.788", and an install height of 2.000". At the installed height, the load is 250 lbs, with an open load of 765 lbs at 1.200" spring open height. The spring rate is 644 lbs/in, and the coil bind (max) is 1.150". Recommended valve lift is 0.85". Installation requires careful attention to valve spring installed height and coil bind clearances. Specialized tools for valve spring compression and measurement are recommended. This product is designed for high-performance and racing applications and may require professional installation to ensure proper function and prevent engine damage. These valve springs are a universal fitment based on their dimensions and are compatible with various aftermarket cylinder heads that meet the specified diameter and lift requirements. They are not specific to any particular vehicle make, model, or year, but rather to the valvetrain components they are paired with. Always verify compatibility with your specific cylinder head and camshaft setup.