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Proform 66751

Wedge-Locking Header Bolts for Small Block Chevy, Big Block Mopar, AMC, Buick, Oldsmobile, & Pontiac in 3/8" x 3/4" Long

Proform 66751

778-66751

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Proform 66751 Wedge-Locking Header Bolts for Small Block Chevy, Big Block Mopar, AMC, Buick, Oldsmobile, & Pontiac in 3/8" x 3/4" Long $31.99
Wedge-Locking Header Bolts
  • Small Block Chevy, Big Block Mopar, AMC, Buick, Oldsmobile, & Pontiac
  • 3/8" Diameter x 3/4" Long
  • Black Oxide
  • 12/pkg

  • Proform 66751 Details

    Wedge-Locking Header Bolts

    Fits: GM V6, SBC 265-400, Buick, Olds, Pontiac '79 & earlier, Mopar BB 383-440 exc 413, and AMC V8's with 3/8" bolts

    Note: 3/4" length bolts most often used for cast iron heads. 1" length bolts recommended for aluminum heads.

    Specifications:

    Color
    Black Oxide
    Fastener Finish
    Black oxide
    Fastener Material
    Steel
    Fastener Style
    Bolt
    Head Style
    Hex
    Quantity
    Sold as a set of 12
    Underhead Length (in.)
    0.75
    Thread Size (in.)
    3/8-16
    Manufacturer's Part Number:
    66751

    Proform's Wedge-Locking grade 8 header bolts are designed to keep the bolts from backing out by using a pair of permanently attached special washers.

    So, How Do They Work? When the bolt is torqued to 28+ ft-lbs, the washers' super-hardened external teeth bite into and grip the bottom of the bolt head and the top surface of the header. After being self-locked in this manner, any bolt-loosening rotation is blocked by a wedge-locking action created by the washers' interfacing, matching cams. It's an uphill climb: vibration that might ordinarily loosen the bolt actually increases the wedge-locking tension, securing the bolt even more. Because this simple wedge-locking method uses tension instead of friction, contact with oil actually facilitates the wedge effect. When changing headers, PROFORM Header Bolts can be untightened with a normal wrench, lubricated, and reused. These high quality bolts are sold in complete sets (Enough bolts for both headers).

    66751 is rated 5.0 out of 5 by 1.
    Rated 5 out of 5 by from works great Easy to fit in tights header spot and haven't had to tighten them what so ever
    Date published: 2015-06-05
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    Items You Need
    Some parts are not legal for use in California or other states with similar laws / regulations