* Engine Variations: The 1986 Chevrolet vans could have come with different versions of the 305 cubic inch (5.0L) V8 engine. These variations had different horsepower outputs, ranging from around 145 to 170 hp.
* Fuel Injection vs. Carburetor: The 305 could be equipped with either fuel injection or a carburetor. This impacted horsepower. Fuel injection generally offered more horsepower and efficiency.
* Transmission Type: The transmission choice (automatic vs. manual) could also slightly affect horsepower delivery.
* Model and Trim: The specific model of the van (like the Chevy G-Series) and its trim level could have influenced the engine options available.
To get a more precise answer, you'd need to know:
* The exact model of the van: G-Series, P-Series, etc.
* Engine code: Check the engine compartment for a tag indicating the specific engine type.
* Transmission type: Automatic or manual.
With that information, you can consult a 1986 Chevrolet parts or service manual or use an online resource like a vintage car parts website to find the exact horsepower rating for your specific van.
