Anytime you're boring a block distortion will occur to the cylinders unless you have a honing/torque plate installed as a brace. Ours is CNC machined from 2" thick 6061 billet aluminum. The top and bottom sides are face milled to ensure absolute flatness of the plate. They are bored .060 over so that the plate can be used with 4G64 blocks as well. Lastly, we include 4130 chrome-moly stud inserts to keep the plate from damaging during the torque down process.