This is the preferred valve spring for modified GX 200 and clone engines that will need to turn a max RPM of 7200 to 8500 with cam/rocker combinations where valve lift is less than .325". If you are building a "BP" engine, this is the spring you want for intake and exhaust. Works great with stock valves and retainers as well as our stainless valves and retainers. Higher RPM can be run if shims are placed under this spring, however, shims decrease the spring's range of travel before coil bind, reducing the amount of lift that can be run. For more info, download our spring rate chart here.
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