The main caps are numbered from the factory, eliminating any chance of mismatching. This picture also illustrates another difference between Romeo and Windsor blocks: Romeo blocks have jacking screws in the sides of the cap that press against the block skirt, providing extra support for the cap. The jack screws are reverse threaded and are cut to fit an 8mm Allen key. Tap the cap in place with the wooden end of a hammer handle and turn the jack screws counterclockwise to tighten them to the block. The side bolts thread into the jack screws through the outside of the block and are torqued in the correct sequence. Instead of jack screws, Windsor blocks have dowel pins that fit between the ends of the cap and the engine block.