Doug's Headers D329 Full-Length Fenderwell Headers 1-3/4" Small Block Chevy

The Doug's Headers D329 is a premium full-length fenderwell exhaust header designed for 1962-1967 Chevy II and Nova applications with Small Block Chevrolet 265-400 engines. These professional-grade headers feature a 4-tube design with 1-3/4 inch primary tube diameter and 3.00 inch collector diameter, engineered to maximize exhaust flow and increase horsepower and torque throughout the RPM range.

Construction and Design Features:

• 3/8 inch thick machined flanges to prevent warping under high temperatures
• CNC mandrel-bent tubes for precise fitment and improved exhaust flow
• Heavy-duty 16-gauge steel tubing for extended durability
• Precision-formed long transition collectors and long-tube design reduce backpressure
• Round cylinder head port shape with 3-bolt collector flange attachment
• Fenderwell exit style for maximum ground clearance

What's Included:

• Pair of exhaust headers (left and right)
• Mounting hardware (bolts and studs)
• Premium gaskets (rated to 1100°F and 3700 psig)
• Collector reducers (exit diameter 2.500 inches)
• Detailed installation instructions

Doug's Headers has been manufacturing high-quality, hand-built exhaust systems since 1958. Each header is carefully developed and tested on the actual vehicle platform to ensure proper fitment. Every Doug's header is precisely tuned with optimal tube size and length to efficiently evacuate exhaust gases from each cylinder, reducing pumping losses and delivering dramatic increases in engine performance.

Available Finishes: This part number D329 is available in multiple finish options including Metallic Ceramic Thermal Barrier Coating (MCTBC) with silver finish, Hi-Temp Black Coating, Raw Steel for custom finishing, and 304 Stainless Steel construction. The specific finish may vary by supplier.

Emissions Note: These headers are designed for competition use, pre-emission controlled vehicles, or off-highway use only. Emissions compliance varies by application and finish—consult manufacturer specifications for your specific vehicle and jurisdiction.