Kooks Headers Header Flange Adapter Plates

Kooks Headers Header Flange Adapter Plates are precision-engineered solutions for builders and racers who need to bridge different bolt patterns between large-tube headers and cylinder heads. Whether you're adapting a diagonal bolt pattern to an inline stock pattern, or fitting headers to heads with a non-matching flange layout, Kooks adapter plates provide a reliable, leak-free connection that holds up under the extreme heat and stress of high-performance use.

Why Use a Header Flange Adapter Plate?

When running large-displacement, high-horsepower engines, oversized header tubes can overlap bolt hole access points on cylinder heads, making direct installation impossible. In other situations, aftermarket race headers use a different bolt pattern than the stock or aftermarket cylinder head. Kooks adapter plates solve both problems, allowing builders to run the headers they want without compromising on fitment or exhaust sealing.

Key Features:

• Machined to precise tolerances for a flush, leak-free mating surface between headers and cylinder heads
• Countersunk holes allow adapter plates to bolt flush to the cylinder head using the existing stock bolt pattern
• Threaded holes accommodate the header's bolt pattern, securing the header firmly to the adapter plate
• Constructed from durable mild steel for strength and long-term reliability in high-heat exhaust environments
• Kits include gaskets and hardware needed for complete installation
• 100% manufactured in the USA

Backed by over 60 years of racing heritage, Kooks Headers and Exhaust has been the trusted name in high-performance exhaust since 1962. As a family-owned, independently operated American manufacturer, every Kooks component is handcrafted in the USA and held to the highest standards of quality — the same standards that have earned Kooks hundreds of championships across NHRA, IHRA, NMCA, NMRA, NASCAR, SCCA, and more. Kooks is also ISO 9001:2015 certified, ensuring consistent manufacturing quality across their entire product line.