* Header Manufacturer: Different manufacturers use different materials and designs, leading to varied torque recommendations. Always check the instructions that came with *your specific* headers. This is the most important source of information.
* Header Material: Steel headers will have a different torque spec than cast iron headers. Steel generally requires less torque.
* Nut and Bolt Type: The type of fastener (grade of bolt, etc.) will affect the torque spec.
* Engine Type: While the chassis is the same, the engine (small block, big block, etc.) and its placement might slightly influence the torque requirements.
Without knowing the specific header make, model, and material, I cannot give you a reliable torque specification. Attempting to use a general torque value could result in damaged headers, stripped threads, or even a cracked engine block.
Always consult your header's installation instructions. If you don't have them, try contacting the manufacturer or searching online for the instructions specific to your headers. If all else fails, a local mechanic specializing in classic cars should be able to assist.
