* Year of the engine: Manifold bolt patterns and materials changed slightly over the years.
* Type of intake manifold: Different manifolds (e.g., aluminum vs. cast iron) will have different torque specifications.
* Specific manifold manufacturer: Even within the same general type of manifold, the manufacturer might recommend slightly different torques.
To find the correct torque specification, you MUST consult:
1. Your specific intake manifold's instructions: The manufacturer's instructions (often included with the manifold or found on their website) will provide the correct torque spec. This is the most reliable source.
2. A reputable repair manual specific to your engine's year and model: Factory service manuals (like those from Chevrolet or Haynes) provide torque specifications for various components. These are usually organized by year, engine code, and component.
3. A reliable online resource: Some automotive websites offer torque specifications databases, but be cautious and verify the information with the above sources if possible. Always double-check the accuracy of online information.
Without this specific information, attempting to tighten the bolts could result in damage to the manifold, the head gasket, or the cylinder head itself. Incorrect torque can lead to leaks or cracking. It's crucial to find the correct specification before proceeding.
