Performance valve springs - gen iii hemi (5.7l/6.4l) : made from the same high-strength material as the valve springs found in the dodge Viper- the mopar performance valve spring was designed for high lift camshaft profiles (up to 0.625in lift) such as the mopar performance 5.7l cam (part number p5160018).this spring will work with the factory seats- retainers- and locks and require no shims or machining of the cylinder head (shims required for 6.4l application).
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