Engine Header Bolts; Wedge-Locking Technology; Hex Head Type; M8 Thread X 1.181 Inch Long; Shiny Nickel Plated Finish; 12.9 Steel; 12 Pcs in kit; Fits GM LS Engines with 3/8 Wide Flange
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.
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.
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 |