PROFORM Exhaust Header Bolt Set 3/8"-16X1" Wedge-Locking Small Block/Big Block



  • 3/8"-16 X 1" Thread Size
  • Wedge Locking Washers
  • No Clips Or Adhesives Needed
  • Grade 8+ Steel Bolts

PROFORM Wedge-Locking Exhaust Header Bolt Set with a 3/8"-16X1" Thread Size for all Small Block or Big Block Engines.

If your exhaust header bolts are ready to be replaced and you’re tired of constantly checking these bolts to ensure they have not come loose then this PROFORM Wedge-Locking Exhaust Header Bolt Set with a 3/8"-16X1" Thread Size is literally designed for you. The goal of these wedge-locking header bolts is to ensure they stay tightly fastened without being jiggled loose by simple, daily driving.

Features and Benefits:
- 3/8”-16X1” thread
- Fits small block and big block engines
- Manufactured from grade 8+ steel
- Wedge-locking washers
- No special clips or adhesives needed
- Easily installs

These replacement bolts utilize 3/8”-16X1” threads and fit small block or big block engines. The key and truly impressive feature of these bolts is the wedge-locking. Once the bolt is torqued (tightened) to 28 plus feet per pounds, the super-hardened washers kick in. Effectively the teeth bite into and grip the bottom of the bolt head and the top surface of the header. Once this happens the bolts are self-locked into place and any bolt-loosening rotation is blocked by a wedge-locking action created by the washers interfacing, matching cams. Vibration that might ordinarily loosen the bolt actually increases the wedge-locking tension, securing the bolt even further. Because this simple wedge-locking method uses tension instead of friction, contact with oil actually facilitates the wedge effect. When you do need to change these bolts or work on your header they will easily un-lock with a simple wrench!

Vehicle Applications:
- 1965-1995 Mustangs
- 1966-1977 Broncos
- 1948-1979 F-100s

PROFORM is a leader in the high-performance automotive aftermarket by engineering and manufacturing creative products from intelligent concepts.  Their goal is to provide the performance enthusiast with innovation, quality and affordability in all their products - giving the customer maximum value. With dozens of patents, thousands of SKUs and millions of satisfied customers, PROFORM has brought innovation, quality and affordability to enthusiasts for over 30 years.

Order this PROFORM Wedge-Locking Exhaust Header Bolt Set with a 3/8"-16X1" Thread Size for your Small Block or Big Block Engine today from CJ Pony Parts.

California Residents: Proposition 65 Warning

Vehicle Fitment

This product will fit the following Bronco years:

This product will fit the following F-100 years:

  • 1948,
  • 1949,
  • 1950,
  • 1951,
  • 1952,
  • 1953,
  • 1954,
  • 1955,
  • 1956,
  • 1957,
  • 1958,
  • 1959,
  • 1960,
  • 1961,
  • 1962,
  • 1963,
  • 1964,
  • 1965,
  • 1966,
  • 1967,
  • 1968,
  • 1969,
  • 1970,
  • 1971,
  • 1972,
  • 1973,
  • 1974,
  • 1975,
  • 1976,
  • 1977,
  • 1978,
  • 1979,

This product will fit the following Mustang years:

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