* Small-block V8 (5.0L or 5.7L): These were the most prevalent engines. The 5.7L was likely more common than the 5.0L.
* Small-block V8 (6.2L Diesel): A diesel option was also available, but less common than the gasoline V8s.
To know for certain which engine is in *a specific* 1986 Suburban, you'd need to check the vehicle's documentation (owner's manual, vehicle identification number (VIN) decoding) or look at the engine itself (usually a plate or casting will indicate the displacement).
