Steve, I was gonna mention the
oil drainback holes but ffr beat me to it...also look into installing some oiling restrictors for your use (street or race); I recommend you use studs for the rocker assemblies rather than the bolts, but if you use the bolts, be careful that you put the long bolt in the correct location, or you'll punch through into the intake port runner; and gasket match the intake and heads if necessary.