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Pro Form 0.984 inch Wedge-Locking Header 12 Bolts Nickle Finish GM LS Engines

$31.95

Pro Form

Model #66754


Shopper Award

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.

Features:

  • Grade 8 (12.9) Steel
  • Hex Head Type
  • M8 Diameter, .984-inch Length
  • Sold as Set of 12
Fitments:
  • GM LS Engines w/ 1/4-inch Wide Flange




Proposition 65

/!\ warningWARNING: Cancer and Reproductive Harm

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Vehicle Engine Notes
2007-2013
Chevrolet Avalanche

8 Cylinder 5.3 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2007-2009
Chevrolet Avalanche

8 Cylinder 6.0 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2002-2006
Chevrolet Avalanche 1500

8 Cylinder 5.3 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
1997-1999
Chevrolet C1500

8 Cylinder 5.7 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
1997-1999
Chevrolet C1500 Suburban

8 Cylinder 5.7 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
1997-2000
Chevrolet C2500

8 Cylinder 5.7 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
1997-1999
Chevrolet C2500 Suburban

8 Cylinder 5.7 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
1997-2000
Chevrolet C35

8 Cylinder 5.7 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
1997-2000
Chevrolet C3500

8 Cylinder 5.7 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2010-2017
Chevrolet Camaro

8 Cylinder 6.2 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2014-2015
Chevrolet Camaro

8 Cylinder 7.0 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
1997-2002
Chevrolet Camaro

8 Cylinder 5.7 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2011-2017
Chevrolet Caprice

8 Cylinder 6.0 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2004
Chevrolet Cargo Van

8 Cylinder 6.0 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
1997-2000
Chevrolet Cargo Van

8 Cylinder 5.7 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2014-2017
Chevrolet Cheyenne

8 Cylinder 6.2 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2007-2014
Chevrolet Cheyenne

8 Cylinder 5.3 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2009-2012
Chevrolet Colorado

8 Cylinder 5.3 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2008-2017
Chevrolet Corvette

8 Cylinder 6.2 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2006-2013
Chevrolet Corvette

8 Cylinder 7.0 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2005-2007
Chevrolet Corvette

8 Cylinder 6.0 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
1997-2004
Chevrolet Corvette

8 Cylinder 5.7 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2003-2014
Chevrolet Express 1500

8 Cylinder 5.3 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
1997-2002
Chevrolet Express 1500

8 Cylinder 5.7 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2003-2019
Chevrolet Express 2500

8 Cylinder 6.0 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2003-2017
Chevrolet Express 2500

8 Cylinder 4.8 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2003-2005
Chevrolet Express 2500

8 Cylinder 5.3 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
1997-2002
Chevrolet Express 2500

8 Cylinder 5.7 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2003-2019
Chevrolet Express 3500

8 Cylinder 6.0 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2003-2017
Chevrolet Express 3500

8 Cylinder 4.8 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2003-2008
Chevrolet Express 3500

8 Cylinder 5.3 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
1997-2002
Chevrolet Express 3500

8 Cylinder 5.7 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2010-2019
Chevrolet Express Cargo

8 Cylinder 6.0 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2009
Chevrolet Express Cargo

8 Cylinder 5.3 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2009-2019
Chevrolet Express Pasajeros

8 Cylinder 6.0 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2009-2014
Chevrolet Express Pasajeros

8 Cylinder 5.3 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2006-2009
Chevrolet Impala

8 Cylinder 5.3 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
1997-1999
Chevrolet K1500

8 Cylinder 5.7 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
1997-1999
Chevrolet K1500 Suburban

8 Cylinder 5.7 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
1997-2000
Chevrolet K2500

8 Cylinder 5.7 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
1997-1999
Chevrolet K2500 Suburban

8 Cylinder 5.7 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
1997-2000
Chevrolet K3500

8 Cylinder 5.7 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
1999-2000
Chevrolet L30

8 Cylinder 5.7 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2016-2018
Chevrolet LCF 3500

8 Cylinder 6.0 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2006-2007
Chevrolet Monte Carlo

8 Cylinder 5.3 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
1997-2000, 2002-2004
Chevrolet P30

8 Cylinder 5.7 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
1997-1999
Chevrolet Silverado

8 Cylinder 5.7 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2009-2017
Chevrolet Silverado 1500

8 Cylinder 6.2 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
1999-2014
Chevrolet Silverado 1500

8 Cylinder 5.3 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2003-2013
Chevrolet Silverado 1500

8 Cylinder 6.0 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
1999-2013
Chevrolet Silverado 1500

8 Cylinder 4.8 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2007
Chevrolet Silverado 1500 Classic

8 Cylinder 6.0 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2007
Chevrolet Silverado 1500 Classic

8 Cylinder 4.8 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2007
Chevrolet Silverado 1500 Classic

8 Cylinder 5.3 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2001-2003, 2005-2006
Chevrolet Silverado 1500 HD

8 Cylinder 6.0 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2007
Chevrolet Silverado 1500 HD Classic

8 Cylinder 6.0 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
1999-2014
Chevrolet Silverado 2500

8 Cylinder 5.3 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2006-2013
Chevrolet Silverado 2500

8 Cylinder 4.8 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
1999-2004
Chevrolet Silverado 2500

8 Cylinder 6.0 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2000-2002
Chevrolet Silverado 2500

8 Cylinder 5.7 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2001-2019
Chevrolet Silverado 2500 HD

8 Cylinder 6.0 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2007
Chevrolet Silverado 2500 HD Classic

8 Cylinder 6.0 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2001-2006, 2008-2013, 2015-2018
Chevrolet Silverado 3500

8 Cylinder 6.0 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2001-2004
Chevrolet Silverado 3500

8 Cylinder 5.7 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2007
Chevrolet Silverado 3500 Classic

8 Cylinder 6.0 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2007-2019
Chevrolet Silverado 3500 HD

8 Cylinder 6.0 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2003-2006
Chevrolet Sonora

8 Cylinder 5.3 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2000-2002
Chevrolet Sonora

8 Cylinder 5.7 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2014-2017
Chevrolet SS

8 Cylinder 6.2 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2005-2006
Chevrolet SSR

8 Cylinder 6.0 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2003-2004
Chevrolet SSR

8 Cylinder 5.3 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2016-2019
Chevrolet Suburban

8 Cylinder 6.0 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2014
Chevrolet Suburban

8 Cylinder 5.3 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2000-2014
Chevrolet Suburban 1500

8 Cylinder 5.3 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2006-2009, 2011-2013
Chevrolet Suburban 1500

8 Cylinder 6.0 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
1997-2002
Chevrolet Suburban 1500

8 Cylinder 5.7 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2000-2013
Chevrolet Suburban 2500

8 Cylinder 6.0 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2012
Chevrolet Suburban 2500

8 Cylinder 5.3 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2016-2019
Chevrolet Suburban 3500 HD

8 Cylinder 6.0 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2000-2014
Chevrolet Tahoe

8 Cylinder 5.3 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2008-2013
Chevrolet Tahoe

8 Cylinder 6.0 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2000-2009
Chevrolet Tahoe

8 Cylinder 4.8 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2008-2009
Chevrolet Tahoe

8 Cylinder 6.2 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
1997-2000
Chevrolet Tahoe

8 Cylinder 5.7 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2006-2009
Chevrolet Trailblazer

8 Cylinder 6.0 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2006-2009
Chevrolet Trailblazer

8 Cylinder 5.3 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt
2003-2006
Chevrolet Trailblazer EXT

8 Cylinder 5.3 Liter
  • Hex Head; M8 X .984in; Chevy LS; Nickel Plt

About Proform

PROFORM Parts (Specialty Auto Parts of America, Inc.) is a market leader in the high-performance automotive aftermarket, developing, and manufacturing innovative products based on innovative principles. Proform was established in 1983 and its headquarters are located in Warren, Michigan. Their mission is to supply performance enthusiasts with innovative, high quality, and affordable tools, maximizing the customer's value. For over 30 years, Proform has been bringing innovation, quality, and affordability to enthusiasts for over 30 years, with dozens of patents, thousands of SKUs, and millions of delighted consumers. Each Proform component is engineered to maximize performance, value, and style.

Proform Innovation

PROFORM owns the trademarks for dozens of components and product designs and is constantly developing new products as well as expanding and improving their existing product offerings. They were the first to make affordable, non-remanufactured car parts and accessories widely available and were the first to offer the two-piece timing chain cover, the two-stage in-line fuel filter, HEI distributor tune-up kits, and direct-replacement carburetor main bodies. Furthermore, they were the first to popularize GM Officially Licensed parts with the popular Chevrolet, Bow Tie, and other divisional trademarks, as well as Ford Performance Licensed products with the Ford (sold under the PROFORM Factory Performance Parts designation).

Proform Quality

Proform offers unique tools, alternators, stock harmonic balancers, and distributors; a line of roller-tipped rocker arms with the widest selection of manufacturing processes (stamped steel, cast chrome moly, and machined extruded aluminum); and a complete line of popular and easy-to-use engine builders' tools made to intricate specifications.

PROFORM PRICING

Proform Parts are engineered to deliver the optimal balance of high quality and economic price value. These prices are the consequence of a skilled and efficient global manufacturing process, not of cost cutting. The experienced management team, product designers, engineers, and manufacturing employees work to service their customers while identifying issues to add value and meeting the demands of the enthusiast with high-quality, low-cost parts.

Proform is the factory source for Licensed Chevrolet Performance Engine Dress Parts, Licensed Ford Performance Products, carburetors, HEI distributors, electric water pumps, electric fans, engine components, and street performance equipment.

Proform Manufactures

Over 1000 engine performance components, including carburetors, rocker arms, HEI distributors, parts for GM, Ford, and Mopar, carburetors, and tools, are manufactured by this company.

Proform's components range from steel or aluminum rollers, wire alternators, wrenches, circuit testers, rotating electrical wires, building tools, starters, vehicle scales, and radiators.

Watch how Proform components are manufactured under high standards of quality.

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