* Specific Year and Model: Even within the "250 long block" designation (referring to the engine's length), there were variations across years of production. The head bolt pattern and recommended torque may differ slightly.
* Head Gasket Type: The type of head gasket (e.g., composite, MLS) will impact the tightening procedure. Different gaskets have different compression requirements.
* Head Bolt Condition: Reused head bolts are generally not recommended, as they may not be able to withstand the required clamping force. New bolts are always preferable.
Therefore, you MUST consult a factory service manual for your specific engine. This manual will provide the correct sequence (typically a phased approach, tightening in several passes to evenly seat the head) and torque specifications (in lb-ft or Nm). The manual will also likely specify the type of head bolts to use and whether they should be replaced.
Without this information, attempting to tighten the head could lead to:
* Warped Head: Uneven tightening causes stress and can warp the cylinder head.
* Head Gasket Failure: Improper torque will prevent proper sealing, leading to leaks and overheating.
* Damaged Engine Block: Over-tightening can crack the engine block.
Finding the correct service manual: You can usually find these online through sites selling automotive repair manuals or through online forums dedicated to classic Ford vehicles. Searching for "Ford 250 [year] service manual" will likely yield good results. Remember to specify the exact year and model of your vehicle for accuracy. Don't rely on generic information; use only the manual for your specific engine.
