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Buy 3 Tires, Get 4th Tire Free Instantly. Receive a discount equal to the price of a single tire when four tires are added to the cart. Valid on select in stock tires only. Those tires for which discount is available will be identified in search results & product detail pages. All other tires and special order tires are excluded from this offer. Valid when scheduled for installation on PepBoys.com and installation is completed between 6/26/17 through 9/30/17.


Proform Wedge Locking Header Bolts 20058977
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  • Part #: 66751|
  • SKU: 20058977

Available


    • NO MORE wires, adhesives, clips, special tools, or any other gimics. Just tighten these locking bolts and you're done!
    • Fits GM V6, SB 265-400, Buick, Olds, Pontiac '79 and earlier, Mopar BB 383-440 exc 413, AMC V8's w 3/8" bolts
Retail
$29.99

Proform Wedge Locking Header Bolts

HOW THEY WORK: 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. 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.
  • NO MORE wires, adhesives, clips, special tools, or any other gimics. Just tighten these locking bolts and you're done!
  • Fits GM V6, SB 265-400, Buick, Olds, Pontiac '79 and earlier, Mopar BB 383-440 exc 413, AMC V8's w 3/8" bolts
  • Engine Header Bolts; Wedge-Locking Technology; Hex Head Type; 3/8-16 Thread X 3/4 Inch Long; Black Oxide Finish; 12 Pcs in kit
  • 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.
Restrictions
  • WEB ORDER ONLY!
PROFORM(R) manufactures creative products from innovative concepts, and our goal is to provide you with very high-quality products at very affordable prices - thus giving you maximum value.

Bolt Material
Grade 8 Steel
Head Type
Hex Head
Color
Black Oxide

20058977

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