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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Orderable Status:YesQuantity:1Package UOM:Smallest Pack (Consumer Level)Package Level GTIN:00023913727307Package Bar Code:023913727307Weight Variance:0.000000000Stacking Factor:0Inner Quantity:0
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Country of Origin (Primary):ITEmission Code:Legal USHarmonized Tariff Code (HTS):8409914000Harmonized Tariff Code (Schedule B):8409914000Life Cycle Status Code:Available to OrderLife Cycle Status Description:Available to OrderMSDS Required Flag:NoNational Popularity Code:Non-Stock ItemNational Popularity Description:Non-Stock Item
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Elring:057.290Fel-Pro:ES72483Ford:1 118 008 (13X)Ford:1 118 011 (7X)Ford:YM21 6065 AA (13X)Ford:YM21 6065 BA (7X)MAHLE Original:GS33461MAHLE Original:GS33462Navistar:022103384CSeat:022 103 384 C (13X)Seat:022 103 384 D (7X)Volvo Cars:022 103 384 C (13X)Volvo Cars:022 103 384 D (7X)