MOPAR 3.9L V6 HEADER KIT Item Number: 6916 (8) 5/16-18x7/8" bolts 6pt DHH. Stage 8 manufacturers the World's Best Active Mechanical Locking systems. Our locking fastener solutions are fail-safe when used and installed as directed. They are removable and reusable and can be visually inspected; if the locking retainer and clip are present then no fastener rotation has occured. Our locking systems are used on the Space Shuttle, Caterpiller Tractors, Ford Racing, Armored Combat Vehicles and many, many other applications.
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