* Year of the engine: Pontiac 400s were produced over several years, and specs changed.
* Head type: Different head castings (e.g., rectangular port, oval port) might have slightly different specifications.
* Head bolt type: Are they standard bolts, studs, or aftermarket?
* Head gasket material: The gasket material can influence the torque procedure.
You absolutely must consult a factory service manual specific to the year and model of your Pontiac GTO. This manual will provide the correct torque sequence and specifications. Using incorrect torque values can lead to warped heads, blown head gaskets, or even cracked cylinder heads, causing significant engine damage.
Trying to find the torque specs online without knowing the precise engine details is risky. A Haynes manual or a factory service manual (often available online as PDFs or through vendors) is your best bet for accurate information.
