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What is the recommended timing specification for a 89 S10 Chevy pickup with 2.5L engine?

The recommended timing specification for a 1989 Chevy S10 pickup with a 2.5L engine is 10 degrees BTDC (Before Top Dead Center) at idle. However, this is just a starting point.

Important Considerations:

* This is a general guideline. The actual optimal timing can vary slightly depending on the condition of the engine, altitude, and fuel used.

* Consult your owner's manual: The most accurate timing specification will be found in your vehicle's owner's manual.

* Professional timing adjustment: Timing adjustments should ideally be done by a qualified mechanic using a timing light. Improper timing can damage your engine.

* Engine wear and tear: As an engine ages, the optimal timing might change slightly. A mechanic can assess this during a tune-up.

It's crucial to use a timing light to accurately set the timing. Simply setting it based on a number without a timing light will likely be inaccurate. Don't attempt this without the proper tools and knowledge.