PROFORM 66754 Wedge-Locking Header Bolts; Hex Head; M8 X .984in; Chevy LS; Nickel Plt; 12 Pcs

Engine Header Bolts; Wedge-Locking Technology; Hex Head Type; M8 Thread X .984 Inch Long; Shiny Nickel Plated; 12.9 Steel; 12 Pcs in kit; Fits GM LS Engines with 1/4in Wide Flange

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Each PROFORM 12.9 Steel (equiv. 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.

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Application Summary:

Year	Make/Model
2007-2013	Chevrolet Avalanche
2002-2006	Chevrolet Avalanche 1500
1997-1999	Chevrolet C1500
1997-1999	Chevrolet C1500 Suburban
1997-2000	Chevrolet C2500
1997-1999	Chevrolet C2500 Suburban
1997-2000	Chevrolet C35
1997-2000	Chevrolet C3500
1997-2002	Chevrolet Camaro
2010-2017	Chevrolet Camaro
2011-2017	Chevrolet Caprice
1997-2000	Chevrolet Cargo Van
2004	Chevrolet Cargo Van
2007-2017	Chevrolet Cheyenne
2009-2012	Chevrolet Colorado
1997-2017	Chevrolet Corvette
1997-2014	Chevrolet Express 1500
1997-2019	Chevrolet Express 2500
1997-2019	Chevrolet Express 3500
2009-2019	Chevrolet Express Cargo
2009-2019	Chevrolet Express Pasajeros
2006-2009	Chevrolet Impala
1997-1999	Chevrolet K1500
1997-1999	Chevrolet K1500 Suburban
1997-2000	Chevrolet K2500
1997-1999	Chevrolet K2500 Suburban
1997-2000	Chevrolet K3500
1999-2000	Chevrolet L30
2016-2018	Chevrolet LCF 3500
2006-2007	Chevrolet Monte Carlo
1997-2000	Chevrolet P30
2002-2004	Chevrolet P30
1997-1999	Chevrolet Silverado
1999-2017	Chevrolet Silverado 1500
2007	Chevrolet Silverado 1500 Classic
2001-2003	Chevrolet Silverado 1500 HD
2005-2006	Chevrolet Silverado 1500 HD
2007	Chevrolet Silverado 1500 HD Classic
1999-2014	Chevrolet Silverado 2500
2001-2019	Chevrolet Silverado 2500 HD
2007	Chevrolet Silverado 2500 HD Classic
2001-2006	Chevrolet Silverado 3500
2008-2013	Chevrolet Silverado 3500
2015-2018	Chevrolet Silverado 3500
2007	Chevrolet Silverado 3500 Classic
2007-2019	Chevrolet Silverado 3500 HD
2000-2006	Chevrolet Sonora
2014-2017	Chevrolet SS
2003-2006	Chevrolet SSR
2014	Chevrolet Suburban
2016-2019	Chevrolet Suburban
1997-2014	Chevrolet Suburban 1500
2000-2013	Chevrolet Suburban 2500
2016-2019	Chevrolet Suburban 3500 HD
1997-2014	Chevrolet Tahoe
2006-2009	Chevrolet Trailblazer
2003-2006	Chevrolet Trailblazer EXT