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Pro Form 1.181 inch Wedge-Locking Header 12 Bolts Nickle Finish GM LS Engines
$34.95
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, 1.181-inch Length
  • Sold as Set of 12
Fitments:
  • GM LS Engines with 3/8-inch Wide Flange




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Vehicle
2007-2013
Chevrolet Avalanche
2002-2006
Chevrolet Avalanche 1500
2002-2006
Chevrolet Avalanche 2500
1997-1999
Chevrolet C1500
2000
Chevrolet C2500
1997-2000
Chevrolet C35
1997-2000
Chevrolet C3500
1997-2002, 2010-2017
Chevrolet Camaro
2011-2017
Chevrolet Caprice
2007-2017
Chevrolet Cheyenne
2009-2012
Chevrolet Colorado
1997-2017
Chevrolet Corvette
1997-2014
Chevrolet Express 1500
2015-2019
Chevrolet Express 2500
2006-2009
Chevrolet Impala
1997-1999
Chevrolet K1500
1997-1999
Chevrolet K1500 Suburban
1997-1999
Chevrolet K2500
2006-2007
Chevrolet Monte Carlo
1997-1999, 2002
Chevrolet P30
2014-2017
Chevrolet SS
2003-2006
Chevrolet SSR
1999-2017
Chevrolet Silverado 1500
1999-2018
Chevrolet Silverado 2500
2019
Chevrolet Silverado 2500 HD
2001-2013, 2015-2018
Chevrolet Silverado 3500
2014, 2019
Chevrolet Silverado 3500 HD
2014, 2016-2019
Chevrolet Suburban
2000-2013
Chevrolet Suburban 1500
1997-2014
Chevrolet Tahoe
2003-2009
Chevrolet Trailblazer

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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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