Using new head bolts when performing a cylinder head installation is always a good idea however, on late-model engines that came from the factory with TTY (torque-to yield) head bolts, replacement is an absolute necessity. TTY bolts are designed to exert the maximum clamping force for a tight head gasket seal, however they permanently stretched and could fail if re-used.
Engine Cylinder Head Bolt Set
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Package Information
Orderable Status:YesQuantity:1Package UOM:Smallest Pack (Consumer Level)Package Level GTIN:00023913727048Package Bar Code:023913727048Weight Variance:0.000000000Stacking Factor:0Inner Quantity:0
Extended Information
Country of Origin (Primary):TWEmission Code:Legal USHarmonized Tariff Code (HTS):8484100000Harmonized Tariff Code (Schedule B):8484100000Life Cycle Status Code:Available to OrderLife Cycle Status Description:Available to OrderMSDS Required Flag:NoNational Popularity Code:New Item 3 Months, 6 Months, etc.National Popularity Description:New Item 3 Months, 6 Months, etc.
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BMW:11 12 1 729 247BMW:11 12 7 583 116Elring:198.740