1. Visual Inspection:
* Engine Casting Numbers: Look for casting numbers on the engine block itself. These numbers are usually found on the side of the block, near the front, or on the top of the valve covers. These numbers are crucial for identification. Take high-quality photos and carefully transcribe them. You can then cross-reference these numbers using online databases or engine identification guides. Websites specializing in GM parts are excellent resources.
* Valve Covers: The valve covers often have markings that indicate the engine family or displacement.
* Intake Manifold: The intake manifold might have casting numbers or markings that can be used for identification.
* Air Cleaner: While less reliable, the air cleaner might have markings related to the engine it was designed for.
* Alternator and Power Steering Pump: These components, while not definitive, can sometimes carry markings suggesting the engine family they are compatible with.
2. Check for Engine Tags/Plates:
* Engine Compartment: Sometimes (though rarely on swapped engines), there will be a small tag or plate somewhere in the engine compartment providing details about the engine.
* Under the Hood: Check meticulously; some tags may be hidden or tucked away.
3. Measure Physical Characteristics:
* Engine Dimensions: While not precise enough to identify the exact engine, measuring the overall length, width, and height of the engine block can help narrow down possibilities.
* Bolt Patterns: The bolt patterns for the bellhousing, intake manifold, and other components can give clues about the engine type.
4. Utilize Online Resources:
* Online Databases: Websites dedicated to car parts and engine identification (often with searchable databases using casting numbers) are indispensable.
* Forums: Online forums dedicated to classic GM vehicles (like El Caminos) are a great place to post pictures of your engine's casting numbers and ask for help in identification. Include as many details as possible.
5. Consult a Mechanic:
A seasoned mechanic experienced with classic GM vehicles can often identify an engine by visual inspection and a feel for its components.
Important Note: The process will be significantly easier if you can provide a clear, well-lit photo of the engine block casting numbers. These numbers are the most reliable way to identify the engine. Don't rely on just the cubic inch displacement—many engines shared the same displacement across different years and models.
