Kooks stock-style big block Chevy header flange with 2-1/2" port — the big tube size for serious BBC builds (454+ cubes, ported heads, peaky cams). For dedicated BBC race or high-output builds where smaller primaries become the restriction.
Fits BBC cylinder heads with the stock bolt pattern. Round ports sized for 2-1/2" primaries.
Kooks Headers & Exhaust has been hand-building stainless headers and exhaust systems in Statesville, North Carolina since 1962. Every component is fabricated by experienced fabricators in the same shop where the company's racing legacy was built. 3/8" thick 304 stainless steel resists warping under race-level heat cycling.
Sold individually. Pair with Kooks 2-1/2" J-bends (custom-order) and merge collectors.
