Aftermarket Headers
Short answer: For a 350 convertible, the repro Long Branch manifolds (from Ram Air Restorations, ~$369, fit 1967–69, require the oil-filter adapter) flow as well as headers on a 350 without the header headaches. Factory “log” manifolds are cheaper and easier to find but lose some performance (though the 1969 Grand Prix 400 used log manifolds and was rated 350 hp).
Note the Flowmaster/header exhaust kits at Jegs and Summit reportedly don’t fit convertibles. A member researching a 2.25–2.5″ system for a 1969 350 convertible found you can piece one together from Flowmaster/Dynomax mufflers and pipes — but 2.25″ head pipes for stock manifolds and matching tailpipes (without a transverse muffler) were hard to source. (Prices were as of 1999.)
Any proposed updates, changes, pictures, and/or corrections, please use our comment section below (may need to click on permalink to access comments feature). Information is subject to change and offered as is without any warranties or guarantees. Please review our Term's Of Use for more information.
Content last modified: June 13, 2026 at 10:06 am
← Frequently Asked Questions
