The Jardine headers being discussed are specifically for the ‘55/’56 Ford passenger cars. In conversations with Jerry, there was no mention of him making a set for a ‘55-‘57 Thunderbird. There are already several other companies out there making headers for the early T-Bird so I can see where Jerry would not want to make a duplicate of those. On the flip side of this, if the Tri-Y design being worked up for the passenger cars ends up being a step above the conventional four tube header design, then the possibility is always there for a Thunderbird set to be worked up.
Jerry Jardine has worked up another set of Tri-Y headers for the ‘55/56 passenger car chassis and once those are in hand, I’ll test them on the same dyno combination that has been used on the other exhaust setups that have been tested.