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![66825 Wedge-Locking Header Bolts for Big Block Chevy ,Big Block Mopar 413 & Small Block Ford 289-351W [3/8 in. x 1 in. Long]](https://www.jegs.com/images/mini_750/700/778/778-66825.jpg)
Vehicle Info NeededPROFORMPART NUMBER: 778-66825
66825 Wedge-Locking Header Bolts for Big Block Chevy ,Big Block Mopar 413 & Small Block Ford 289-351W [3/8 in. x 1 in. Long]
$3995
1 left in stock
Ships on Sep 14, 2026
Lowest Price GuaranteeWedge-Locking Header Bolts
Wedge-Locking Header BoltsBig Block Chevy 396-502 Ford 5.0L, Small Block 289-351W Mopar 413 3/8 in.-16 Thread Diameter x 1 in. Long Plated Nickel Finish Hex Head Grade 8 Steel Set of 16
Proform 66825 Wedge-Locking Header Bolts for Big Block Chevy, Big Block Mopar 413 & Small Block Ford 289-351W [3/8 in. x 1 in. Long] Features:
- Special washers have super-hardened external teeth that grip the bolt head and header surface when torqued to 28+ ft-lbs
- Self-locked configuration prevents bolt-loosening rotation through a wedge-locking action created by matching cams on the washers
- Vibration increases wedge-locking tension, enhancing the bolt's security
- Simple wedge-locking method relies on tension, allowing oil contact to facilitate the wedge effect
- PROFORM Header Bolts can be untightened with a normal wrench, lubricated, and reused during header changes
Part TypeHeader Bolt
BrandPROFORM
Package Height1.7
Package Width4.5
Package Length6.65
Weight0.835 PG
Part CategoryPerformance Parts
Part FitmentSemi Universal
Vendor Part Number66825
Package Qty1
Package TypeEA
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