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
Notes
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Orderable Status:YesQuantity:1Package UOM:Smallest Pack (Consumer Level)Package Level GTIN:00023913688639Package Bar Code:023913688639Weight Variance:0.000000000Stacking Factor:0Inner Quantity:0
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Country of Origin (Primary):ESEmission 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:Last 5% of Product Group Sales Value National Popularity Description:Last 5% of Product Group Sales Value
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Audi:068 103 384 A (10X)Elring:819.824Fel-Pro:ES74028Ford:1 005 250 (10X)Magirus:HB33103MAHLE Original:GS33424Navistar:068103384ASeat:068 103 384 A (10X)Skoda:068 103 384 A (10X)Volvo Cars:068 103 384 A (10X)