This Athena Cut Ring Head Gasket is specifically engineered to replace BMW part numbers 11127557265 and 11127557266 for the N52 and N54. Factory OEM & MLS head gaskets are only engineered to handle a limited amount of cylinder pressures before they start to leak, causing a range of issues, including engine overheating, loss of power, misfires, and in severe cases, catastrophic engine failure. Athena-SCE Cut Ring Head Gaskets are uniquely designed to handle increased cylinder pressure caused by power modifications, making them the recommended choice for applications making 16+ psi. Design: Athena-SCE's gasket body is composed of Motorgasket, a reinforced material developed by Athena's R&D department. This consists of a steel core covered with two layers of asbestos-free aramid fibre and offers excellent thermal and mechanical resistance without compromising its ability to adapt to mating surfaces. To ensure maximum sealing under all conditions, a silicone bead is also applied to critical sealing areas, such as oil and coolant passages. The AISI 304 stainless steel cooper rings bite into the aluminum head, providing maximum sealing around the cylinder bore and optimizing engine performance, even on engines with nitrous and/or turbo applications that exceed 2 bar boost. Please be aware that the gasket should be 0.5mm to 1mm larger than the piston. For example, if the piston measures 84mm, then the gasket should be the next size up, either 84.5mm or 85mm. Installation instructions: Make sure that the engine block and cylinder head surfaces are clean, flat, and free from any debris, oil, or coolant. Install the Cut Ring gasket on the engine block and ensure that it is properly aligned. Avoid twisting or bending the gasket during installation. Place the cylinder head on top of the gasket and install the head bolts or studs in their correct positions. Follow the manufacturer's recommended torque specifications and tighten the bolts or studs in the proper sequence to ensure even clamping force across the gasket. After the initial tightening, re-torque the head bolts or studs after the engine has been started and then allowed to cool to room temperature. This will ensure that the gasket is properly seated and compressed. It is recommended to not use any additional sealant on the gasket; it is already coated with a silicone bead sealant. Using additional sealant can hinder the performance of the gasket. Notes on Preparation and Installation: Before installation, it is crucial to have the mating surfaces of both the cylinder head and the block professionally cleaned and resurfaced to ensure they are completely flat/straight. It is the responsibility of the engine builder to measure each cooper ring height and verify uniformity across all rings. After initial assembly, it is necessary to allow the engine to complete a full heat cycle, then re-torque your head studs to spec. This means allowing the engine to warm up to its normal operating temperature, remain at operating temperature for several minutes to ensure each component is uniformly heated, then turned off and cooled completely to ambient temperature. BMW N52 Applications: 1 Series 2006-2011 E81/E82/E87/E88 125i / 135i 3 Series 2005-2011 E90/E91/E92/E93 325i / 325xi2006-2013 E90/E91/E92/E93 328i / 328xi / 330i / 330xi 5 Series 2005-2010 E60/E61 525i / 525xi / 528i / 528xi / 530i / 530xi2010-2011 F10/F11 528i 6 Series 2004-2007 E63/E64 630i 7 Series 2005-2008 E65/E66 730i / 730Li X1 Series 2009-2015 E84 X1 xDrive25i / sDrive25i2009-2015 E84 X1 xDrive28i / sDrive28i [Non-Turbo] X3 Series 2006-2010 E83 X3 2.5si / 3.0i2010-2012 F25 X3 xDrive28i [Non-Turbo] X5 Series 2007-2010 E70 X5 xDrive30i Z4 Series 2004-2008 E85/E86 Z4 2.5si / 3.0i / 3.0si2009-2011 E89 Z4 sDrive23i / sDrive30i BMW N54 Applications: 1 Series 2007-2010 E82/E88 135i2011-2012 E82 1M 3 Series 2006-2010 E90/E91/E92/E93 335i2011-2013 E92/E93 335is 5 Series 2008-2010 E60/E61 535i 7 Series 2009-2012 F01/F02 740i / 740Li X6 Series 2008-2010 E71 X6 xDrive35i Z4 Series 2009-2016 E89 Z4 sDrive35i2010-2016 E89 Z4 sDrive35is Alpina B3 Series 2007-2013 E90/E91/E92/E93 B3 Bi-Turbo Alpina B3 S Series 2010-2013 E90/E91/E92/E93 B3 S Bi-Turbo Alpina D3 Series 2008-2013 E90/E91/E92/E93 D3 Bi-Turbo
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