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Tell me Raymond, the box for the air horns in your right front inner fender, how is the bent trumpet shaped section going from the top spring seating back to the firewall arranged? (can be seen if looking in over the wheel) Is it just cut?
Ok, I'll try with photos. This was done for the Ausca GTA engine conversion. Problem was, this is a 37 mm intake port GTA, and needed 120 MM air horns to make power. The box is a structural member now. It was made up of much thicker material than the inner fender well to support the structural member behind, that supports the suspension. We were unsure what the loading would be. All these years and some track time later, we were right, nothing has moved or changed shape. It remains as it was built 40 years ago.

Gordon Raymond