MAPerformance Torque Plate/Deck Plate for GM LS LS1 LS2 LS3 LS6 L92 L96 L33 LM4 LY4 Engines The purpose of this GM LS torque plate is to simulate cylinder distortion that is present only when the cylinder head has been fastened to the engine block. It helps to ensure that the tolerances targeted and achieved during the boring and honing processes remain true with the cylinder head in place; A must for any application looking to exceed factory performance levels. CNC machined from 2" thick billet aluminum, Includes spacers for proper depth of penetration into your GM LS series block. Suitable for bore sizes up to 4.1", 100% Made in the USA. Our GM LS torque plate is compatible with any GM LS variation up to a 4.1" bore including, but not limited to, the following: LS1, LS2, LS3, LS6, L92, L96, L33, LM4, LY4, etc. This product listing includes one plate and corresponding spacers.