Fits 1965-1990 Chevrolet 396-454 Mark IV Big Block. Square Ports, 2.09 Inch GM Avalanche/Escalade/Sierra/Sierra Limited/Silverado/Silverado LD • (5) -6 to 9/16”-18

• (5) -6 to 9/16”-18 Straight Male Fittings

Premium Stainless-Steel Clamps and a Silicone Coupling are used for Strength and Durability Price includes applicable core fee

Superior Clamping Load & Strength - Far exceeds factory torque-to-yield bolts

5-2003 models with a high-boost compressor wheel

5" Suspension Lift for '82 - '04 Chevy S-10/Blazer models

Fits 1965-1990 Chevrolet 396-454 Mark IV Big Block. Square Ports, 2.09 Inch GM Avalanche/Escalade/Sierra/Sierra Limited/Silverado/Silverado LD • (5) -6 to 9/16”-18Manufactured from high temperature steel core graphite faced exhaust material. Expanded steel core provides stability and maximum torque retention to eliminate gasket failure. Graphite facing provides excellent heat resistance and thermal conductivity to transfer heat away from the cylinder head. Conforms to and seals minor surface irregularities. High recovery material allows header or manifold flange to stay sealed if flange loses clamp load. Can be