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Proform - 66752 - Wedge Locking Header Bolts - 3/8 X 3/4L (16)

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The price includes any freight from the supplier to the Store

Product description

Each PROFORM Grade 8 Header Bolt is permanently assembled with a pair of special washers. 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. Its 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. Sold as a set.

Product Details:

Engine Header Bolts
Wedge-Locking Technology
Hex Head Type
3/8-16 Inch x 3/4 Inch Long
Black Oxide Finish
16 Pcs in kit
Fits Big Block Chevy|Ford 5.0L|Small Block Ford|Chrysler 413 Engines
Sold As A Set

Vendor Part Number: 66752

Proform Catalog

The approximate size of the packed product or the sales package is 107 x 34 x 163 mm.

Engine
Chevy BB, Chevy SB, Ford BB, Ford SB

Material
Steel

Thread
3/8-16

Weight
0,3 kg(The product may have a light retail packaging.)

Availability
The product is currently not in stock at our warehouse. Available from our supplier. Estimated arrival at our warehouse 7 - 15 days from order, at the earliest 8.10.2026.

Delivery time?

If the product is available at the Vantaa warehouse, it can be picked up or delivered—usually already within the same day.

When the product shows an estimated delivery time of 7–15 days, this is how the supplier‑warehouse order progresses.

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