MACE CYLINDER HEAD BOLTS FOR NISSAN CIVILIAN W41 TD42 DIESEL 4.2L I6 SUITS 91KWMACE Head Bolt Set Engineered For Strength, Sealed For Reliability MACE cylinder head bolt set is engineered to deliver the precise clamping force required to maintain a secure seal between the cylinder head and engine block. Designed for modern combustion systems, these critical fasteners ensure proper compression while preventing leakage of gases and coolant, even under extreme thermal and mechanical stress. Manufactured from premium grade alloy