* Year of the engine: Torque specs changed over the years the 454 was produced.
* Type of bolt: Are they standard bolts, studs, or something else? Different bolt materials have different torque requirements.
* Water pump type: The design of the water pump itself might influence the torque requirements.
* Repair manual: The most accurate torque specification will always be found in a factory service manual specific to the year and model of your 454.
How to find the correct spec:
1. Identify your engine's year: This is crucial. Look for a casting number on the engine block.
2. Obtain a repair manual: A Haynes, Chilton, or a genuine GM service manual for your specific year 454 will provide the exact torque specifications. These manuals are available online and at auto parts stores.
3. Look for the specification: The manual will have a section dedicated to engine specifications, likely within a chapter on engine removal and installation or cooling system repair.
Attempting to use a general torque spec without the correct manual is risky. Over-tightening can strip the bolt threads or crack the engine block. Under-tightening can lead to leaks. Always use a torque wrench to ensure proper tightening.
