4 Even more important than making sure the main caps are torqued like they will be on final assembly is simulating the warping forces placed on the top of the block by the cylinder heads. It’s impossible to hone the block with the heads in place, so a torque plate like this is used instead. Between the plate and the block is also a gasket of the same thickness that will be used in the final build. While it isn’t absolutely necessary to use the exact same type of head gasket that you will on your final build, make sure it is at least the same size. For example, if your final bore size is 0.030 over, make sure your machinist doesn’t use a 0.060 over gasket simply because it’s big enough. The fire ring is a different size, and that’s what transfers the pressure from the torque plate to the block. It’s not much, but it’s enough to affect the final bore shape.