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The Victor Reinz Engine Cylinder Head Bolt Set is an essential upgrade for any cylinder head installation on your 2001-2011 GM 2500HD/3500HD 6.6L Duramax engine. This set includes 18 high-quality bolts specifically designed to provide a secure, precise fit that meets the demands of a high-performance diesel engine. When replacing or reinstalling the cylinder head, using new head bolts is crucial, especially for engines like this one that use torque-to-yield (TTY) bolts. TTY bolts are engineered to stretch slightly as they’re tightened, which provides a tight, reliable head gasket seal. However, because they stretch, they can’t be reused—reusing them can lead to seal failure, causing costly engine issues down the line.
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