I have the high torque version of the CL1 cam and noticed the cam card recommends only 10.5 LB valve springs. Its the hardened version. That seams pretty light. I am rethinking my build and kinda thinking of trying the GX140 springs as NR says there 16# will these run to the 6K that I am going to see? Think I might save some of the aftermarket parts I have and try to build the motor using as many factory mix mach parts as I can.