Fits GM LS Engines with 1/4in Wide Flange
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.
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.
Information:
12 PcsApplication Summary:
| Year | Make/Model |
|---|---|
| 1997-1999 | Chevrolet C1500 |
| 1997-1999 | Chevrolet C1500 Suburban |
| 1997-1999 | Chevrolet C2500 |
| 1997-1999 | Chevrolet C2500 Suburban |
| 1997-1999 | Chevrolet C35 |
| 1997-1999 | Chevrolet C3500 |
| 1997-1999 | Chevrolet Camaro |
| 1997-1999 | Chevrolet Cargo Van |
| 1997-1999 | Chevrolet Corvette |
| 1997-1999 | Chevrolet Express 1500 |
| 1997-1999 | Chevrolet Express 2500 |
| 1997-1999 | Chevrolet Express 3500 |
| 1997-1999 | Chevrolet K1500 |
| 1997-1999 | Chevrolet K1500 Suburban |
| 1997-1999 | Chevrolet K2500 |
| 1997-1999 | Chevrolet K2500 Suburban |
| 1997-1999 | Chevrolet K3500 |
| 1999 | Chevrolet L30 |
| 1997-1999 | Chevrolet P30 |
| 1997-1999 | Chevrolet Silverado |
| 1999 | Chevrolet Silverado 1500 |
| 1999 | Chevrolet Silverado 2500 |
| 1997-1999 | Chevrolet Suburban 1500 |
| 1997-1999 | Chevrolet Tahoe |
| 1997-1999 | Chevrolet W3500 Tiltmaster |
| 1997-1999 | Chevrolet W4500 Tiltmaster |
| Attributes | |
| Applications | Fits GM LS Engines with 1/4-inch Wide Flange, Fits GM LS Engines with 1/4-inch Wide Flange |
| California Proposition 65 | No |
| Category | Header Bolts, Header Bolts |
| Color | Nickel Plated, Nickel Plated |
| Country of Origin (Primary) | TW |
| Diameter | 8mm |
| Emission Code | Legal US |
| Feature/Benefit | Wedge-Locking Technology, Easy to use, No special clips or adhesives needed, Wedge-Locking Technology Eliminates Constantly Re-Tightening Exhaust Collector Bolts; Blocks Bolt-Loosening Rotation caused by Vehicle Vibrations., Reusable, Backed by a full 30 day limited factory warranty. |
| Finish | Nickel Plated, Nickel Plated, Nickel Plated Steel |
| Harmonized Tariff Code (Schedule B) | 7318159000 |
| Hazardous Material Code | N |
| Length | 0.984 inch |
| Life Cycle Status Code | Available to Order |
| Material | Steel, Steel |
| NAFTA Preference Criterion Code | B |
| Part Type | Header Bolts, Header Bolts |
| SDR Required Flag | N |
| Warranty Time | 1 |
| GTIN | 00037995667543 |