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A torque plate is essential during any boring or honing process. When you torque a head down on the block the threads will cause the cylinder bore to slightly deform, a torque plate takes the place of the head to simulate any distortion that will be caused when the head studs/bolts are tightened. Using a torque plate while boring and/or honing removes these slight bore irregularities. Features: 2" thick billet aluminum Includes spacers (not pictured) to give proper depth of penetration into the block 100% Made in the USA Applications -Subaru EJ25 Engines up to 94mm Bore Included Both adapters for Standard and 1/2" head studs