Description
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.
Information:
12 Pcs
Application 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 |
