The following chart will help you select the correct valve/spring/retainer combination for your GX200 or Clone engine by providing the spring pressures and installed heights achieved with the various combinations. This chart is going to continue to provide further information. So check back!
http://www.arcracing.com/Valve_Spring_Chart.xls
Updated 10/3/09: Added Pressures for DJ-1055T Trick Stock Spring, BP Spring, and Dual Spring (Installed height for Dual Spring Retainers is not yet included.
The coil bind figures DO NOT necessarily mean you can run that much lift with the corresponding valve/retainer combo. YOU MUST check for clearance between retainers and valve guides, and clearance between valves and the piston.