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Proform Wedge-Locking Header Bolts for Small Block Chevy, Big Block Mopar, AMC, Buick, Oldsmobile, & Pontiac in 3/8" x 1" Long

Proform 66753


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Proform Wedge-Locking Header Bolts for Small Block Chevy, Big Block Mopar, AMC, Buick, Oldsmobile, & Pontiac in 3/8" x 1" Long $30.99
Wedge-Locking Header Bolts
  • Small Block Chevy, Big Block Mopar, AMC, Buick, Oldsmobile, & Pontiac
  • 3/8" Diameter x 1" Long
  • Black Oxide
  • 12/pkg

  • Proform 66753 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.


    Black Oxide
    Fastener Finish
    Black oxide
    Fastener Material
    Fastener Style
    Head Style
    Sold as a set of 12
    Underhead Length (in.)
    Thread Size (in.)
    Manufacturer's Part Number:

    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).

    66753 is rated 5.0 out of 5 by 2.
    Rated 5 out of 5 by from Awesome Locking Header Bolts I am amazed on how well these bolts and wedges hold. I have rechecked them after a 100 miles and they are the same tightness as when I installed them.
    Date published: 2016-10-03
    Rated 5 out of 5 by from Great invention !! 2nd time I've used these bolts. I won't use anything else from here on out. Over the years I've had issues with header bolts loosening..what a pain. NOT WITH THESE BOLTS ! Try 'em and you'll like 'em. Kinda pricey........til you use 'em.
    Date published: 2015-02-14
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    Items You Need
    Some parts are not legal for use in California or other states with similar laws / regulations