Hold the timing cover up against the block, use a sharpie to mark out its outline. Tape everything off inside that outline and the head deck surface along with the bottom side of the block. Use high heat engine paint of your brand choice. 2 light sprays, let set 10 minutes between each spray then 1 heavy wet spray (spray clear coat on immediately after you spray wet coat so it mixes with paint otherwise clearcoat will peel the color paint up out of the metal pores) let dry overnight and voila! There ya have a perfect paint coat. (All this was based off of instructions I received from high dollar painters at my autobody assembly job) This is my 318 magnum dirt track engine I just painted the other night. Paint job is tough as nails.