Stage 8 8918S Locking Header Bolt Kit - 5/16-18 and 3/8-16

The Stage 8 8918S Locking Header Bolt Kit provides a complete fastening solution for securing exhaust headers with maximum reliability. This 12-piece kit includes 8 pieces of 5/16-18 x 7/8" bolts and 4 pieces of 3/8-16 x 3/4" 6-point double hex head bolts, designed to prevent loosening under extreme heat and vibration conditions.

Key Features:

• Patented three-piece locking system with bolt, retainer, and spring clip
• Manufactured from 4130 alloy steel for superior strength and durability
• Prevents horsepower loss and gasket failure caused by loose fasteners
• Easy to install and reusable design
• 6-point double hex head configuration for reliable grip
• Application-specific sizing eliminates guesswork

Stage 8's unique locking mechanism uses a spring clip and retainer system that mechanically locks the bolt in place, providing positive retention that won't back out even under extreme temperatures and constant vibration cycles. The 4130 alloy steel construction offers exceptional tensile strength while resisting thread stripping and corrosion. Each kit includes all necessary hardware for complete installation.