I Was Going To Use Cast Rings. If Moly Rings Dont Seal Right Away They Never Will. The Factory Still Use Cast Rings. If There Was A Big Advantage By Using Moly Except Cost Wouldnt Factory Vehicles Use Them
All the factory stuff, domestic & import, use some sort of Moly ring. If the block is honed right, there will be no problem with sealing. This is even true with cast rings.