The last roller cam motor I built had 325 lbs on the seats and 830 lbs opened, it turred over really hard by hand with a breaker bar, it made the oil temps get real hot really quick on the dyno also. I ended up removing some of the valve spring shims to allow .030 more to coil bind and that dropped the open pressures to 800 lbs It runs fine in the car so far Let us know what you find, lots of Murphy gremlins out there