Yes, UNC is coarse thread; UNF is fine thread. And remember that some FSM's have the wrong torque for these bolts; should be around 15-20 ft-lbs, not 30 as listed in some FSM's.
Yeah I got book called "How to hotrod smallblock mopar engine" and there was that wrong torque value. There is also wrong torque value for main bearing cap torque on one page. I double cheked that value after torquing them..
