Headers are designed to precisely match the exhaust port configuration and other features of a specific engine family and often even specific years. Using headers designed for one year on a different year will likely result in:
* Interference: Headers might hit the frame, steering components, or other parts of the vehicle.
* Poor fitment: They might not bolt up to the exhaust ports correctly or may not align with the exhaust system.
* Leaks: Poor sealing due to misalignment.
You must select headers specifically designed for the year, make, and model of your vehicle and the specific engine it has. The year of the 350 itself is crucial, but even within the same year, slight variations exist. Always check the header manufacturer's specifications to ensure compatibility.
