Doug's Headers D324 Long Tube Header Small Block Chevy 1-3/4" Primary Silver Ceramic Coated

The Doug's Headers D324 is a premium long tube header designed for Small Block Chevrolet engines. Featuring 1-3/4" primary tubes with a 3" collector diameter, these full-length headers are engineered to maximize exhaust flow and deliver substantial horsepower and torque gains across the entire RPM spectrum.

Key Features:

• Long tube design reduces backpressure and increases higher RPM horsepower
• 3/8" thick machined flanges prevent warping under extreme heat
• CNC mandrel bent tubes ensure accurate fitment and improved exhaust flow
• Heavy-duty 16-gauge steel tubing construction for long-lasting durability
• Precision formed long transition collectors optimize exhaust scavenging
• Metallic Ceramic Thermal Barrier Coating (MCTBC) with polished silver finish
• Coating provides 60% more corrosion resistance and withstands temperatures up to 1400°F
• SAP (Same As Port) cylinder head port shape for proper fitment
• 3-bolt collector flange attachment
• Includes mounting hardware, premium gaskets, and detailed installation instructions

Each Doug's header is precision-tuned with proper tube size and length to efficiently remove exhaust from each cylinder, reducing pumping losses and resulting in dramatic performance increases. Hand-built with mandrel-bent construction and developed specifically on the vehicles they're designed to fit, these headers represent the quality and performance that Doug's Headers has been known for since 1958.

What's Included:

• Pair of headers
• All necessary mounting hardware and bolts/studs
• Premium extra-thick gaskets rated to 1100°F
• Detailed installation instruction sheets

Note: Designed for factory cylinder head port centerlines. Raised port cylinder heads may cause installation issues. Header applications are based on original engine configuration unless otherwise noted.