Hi I am new to this forum, hope you guys can answer my question. I just finished putting together my first big block chevy (396) and upon adjusting the valves, the motor has become very very difficult to rotate by hand. I have a 20" breaker bar on the crank snout and i get a quarter turn out of the crank, than i feel as if i will break that bolt. I have the new Big mutha thumpr cam hyd. with matching lifters, comp cams bee hive springs, and roller rockers. Just wondering if it should be this difficult to rotate because of the high lift and the stiff springs?? I checked for coil bind and it is with in the limits. Any help would be greatly appreciated. thanks.