1. Assess the Interference:
* Precise Location: First, *exactly* pinpoint where the motor mounts are interfering with the knock sensor's original location. Take detailed pictures.
* Mount Type: The type of motor mounts used (stock S10, aftermarket, etc.) significantly impacts available space.
* Block Features: Examine the engine block itself. Are there any other suitable threaded holes or flat surfaces nearby that could accommodate a knock sensor?
2. Potential Relocation Options (In Order of Preference):
* Nearby Threaded Hole (Ideal): The best solution is to find a nearby, appropriately sized threaded hole in the engine block. This minimizes wiring changes and ensures accurate sensor placement. Consult a shop manual or an engine diagram to identify potential locations. Crucially, ensure the hole is not used for anything else critical.
* Adapter Bracket (Good): If no suitable hole exists, fabricate or purchase an adapter bracket. This bracket would bolt to a convenient location on the block and provide a mounting point for the knock sensor. This requires some fabrication skills or machining.
* Weld-on Bushing (Advanced/Less Ideal): As a last resort, you could weld a threaded bushing onto a suitable flat surface of the block. This is only recommended if you have welding and machining experience, and you'll need to ensure the weld is strong enough and the bushing is correctly aligned.
3. Key Considerations When Choosing a Location:
* Sensor Orientation: The knock sensor needs to be properly oriented to the engine block for optimal sensitivity. Refer to your shop manual for the correct orientation.
* Wiring Length: Make sure the knock sensor's wiring is long enough to reach its connector after relocation. You may need to extend the wiring.
* Heat: The sensor should not be placed in an excessively hot area of the engine.
* Clearance: Ensure the sensor doesn't interfere with any moving parts, belts, or hoses.
4. Important Notes:
* Shop Manual: A factory service manual for your 1989 Chevy Silverado 350 TBI is invaluable. It shows the original knock sensor location and provides detailed engine diagrams.
* Professional Help: If you're not comfortable with fabrication or engine work, it's best to seek the assistance of a qualified mechanic. Incorrect placement can lead to misfires, engine damage, or inaccurate knock detection.
In summary: There's no one-size-fits-all answer. Carefully assess your specific situation, prioritize the use of existing threaded holes if possible, and ensure correct sensor orientation and clearance to avoid problems. Using a shop manual and/or seeking professional help is highly recommended.
