Originally Posted by bastard
If you don't use RTV I can pretty much guarantee that it will leak. As has been mentioned, some of the bolts that hold the water pump on are open to the water jackets.
The original factory gasket used no RTV. The felpro gaskets are a nice rubber coated steel that do a great job sealing everything, as long as you torque the bolts correctly (in other words, don't just tighten until you cant tighten anymore, use a torque wrench.) RTV can be used, but when you need to do this job again in 5 or so years, you will have a hell of a time cleaning RTV off the block to prepare for the new gasket. Old RTV can be a b**** to get off - I recommend against using it unless it does not seal correctly without it.
Use teflon pipe thread sealer on the bolts in the same places the factory did (you can see the old stuff before you clean it off). Then you wont lose coolant through the bolt holes when the job is done.