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Proform 66752

Wedge-Locking Header Bolts for Big Block Chevy , Big Block Mopar 413, Small Block Ford in 3/8" x 3/4" Long

Proform 66752


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Proform 66752 Wedge-Locking Header Bolts for Big Block Chevy , Big Block Mopar 413, Small Block Ford in 3/8" x 3/4" Long $36.99
Wedge-Locking Header Bolts
  • Big Block Chevy , Big Block Mopar 413, Small Block Ford
  • 3/8" Diameter x 3/4" Long
  • Black Oxide
  • 16/pkg

  • Proform 66752 Details

    Wedge-Locking Header Bolts

    Fits: GM BB 396-502 except 348 & 409, Ford 5.0L, SBF 289-302-351W, and Mopar 413 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 16
    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).

    66752 - Proform Wedge-Locking Header Bolts is rated 5.0 out of 5 by 1.
    Rated 5 out of 5 by from Quick, simple easy The headers on my f100 had limited room for access to the bolt heads, and typical header bolts loosen too easily. The locking feature solved both problems.
    Date published: 2016-02-27
    • y_2017, m_11, d_17, h_24
    • bvseo_bulk, prod_bvrr, vn_bulk_2.0.3
    • cp_1, bvpage1
    • co_hasreviews, tv_0, tr_1
    • loc_en_US, sid_10001_10001_2442540, prod, sort_[SortEntry(order=RATING, direction=DESCENDING), SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
    • clientName_jegs

    Are these made in the U.S.A. ?

    Asked by: Lambo
    These are not made in the USA.
    Answered by: Rusty B
    Date published: 2017-08-31
    • y_2017, m_11, d_17, h_24CST
    • bvseo_bulk, prod_bvqa, vn_bulk_2.0.3
    • cp_1, bvpage1
    • co_hasquestionsanswers, tq_1
    • loc_en_US, sid_10001_10001_2442540, prod, sort_[SortEntry(order=LAST_APPROVED_ANSWER_SUBMISSION_TIME, direction=DESCENDING)]
    • clientName_jegs
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