1967-1974 Pontiac / Buick / Oldsmobile LS1 LS6 Small Block Racing Exhaust Manifold Header

• Product By DNA Motoring | SKU: HDS-NOVA74
• Aftermarket Exhaust Header For 67-74 Chevy Pontiac Small Block LS1 LS6 [LS V8 Engine Swaps only]
• 4-1 High Performance Racing Spec. Design, Produces the Most Top End Power
• For Chevy LS V8 Engine swaps only
• 4-Bolt Exhaust Outlet Flange
• 16 Gauge Wall Piping
• 9mm Exhaust Manifold Flange Thickness / 8mm Collector Flange Thickness
• O2 Sensor Bung Insertion and Metal Gasket Included
• Made of High Quality T-304 Stainless Steel with Computerized Mandrel-Bends
• Maximizing Smoothest High Exhaust Air Flow Rate
• Design to Reduce Air Flow Restriction To Achieve Higher Horsepower and Throttle Respond
• TIG Welded CNC Machine Flange for Resistance against Pressure and Corrosion
• Provide Aggressive Deeper Exhaust Note
• Direct Bolt-On Installation, Requires No Modification.
• Professional Installation is Highly Recommended (No Instruction Included).

Our 4-1 Long Tube off-road headers for 1967-1974 Chevy Pontiac Buick and Oldsmobile chassis swapped to the new LS based engines are designed to allow the exhaust gasses to flow more freely from each 4 cylinder bank and combine in a more efficient manner. Tubing has been optimized for the Small Block LS1 and LS6 engines (will also fit truck engines swapped to LS1/LS6 style cylinder heads). This creates a reduction in cylinder backpressure and improved exhaust gas velocity. These improvements free up lost horsepower and torque. An added benefit is a more performance oriented exhaust sound.