[earossi]

Your existing covers should be fine if sealed properly and torqued correctly. To do this remove the covers and check with a straight edge to determine that they are flat across the gasket surfaces. If not, you can lay out some fine wet/dry sandpaper on a flat surface and sand the covers to flat. You can start out with a coarse paper and then move to finer papers. When done, the covers should be flat and the sealing surfaces need to be smooth without an scratches or voids.

Use the paper gaskets specified for the sealing of the covers; however, spread a very thin layer of Loctite 574 on both sides of each gasket before installing.

Lastly, cross torque the covers in place and do NOT over torque the covers. Over torquing them will deform them. IIRC, torque values are very low......down around 8 ft-lbs. So, don't over tighten them.

Done as above, you can expect the gaskets to not leak for the duration of the engine between rebuilds.