[Pushit2.0]

I also run the Crower 415s, I use our single valve springs, same specs as a Crower spring, ~50lbs seat pressure and ~170ish at .4" lift. I put in some .040" shims under my springs to get the pressure up to the 210lbs @.435 lift that the cam card says it needs. I also shaved down the weight of my retainers a few grams to help at high RPM. My cams showed just under the advertised lift at the valve, I think it was .435" (.438") on the intake and .425" (.429") on the exhaust side. But the duration from .05" was 6 deg longer on the intake and 4 deg on the exhaust side. I am happy with my cam/spring/retainer combo they are holding up fine and making good power all the way to 9500rpm. Also Crower springs will coil bind around .955" over all height and be around 260lbs, I think mine are around 1.095" at max lift on the intake side right now.

~John