1. Displacement:
* 4.3L (262ci): This engine is much larger. It's a V6 with a displacement of 4.3 liters (262 cubic inches).
* 2.8L (173ci): This engine is a smaller V6 with a displacement of 2.8 liters (173 cubic inches).
2. External Appearance:
* 4.3L: The 4.3L has a distinctive "tall deck" design. The valve covers are taller and the engine has a more boxy appearance.
* 2.8L: The 2.8L has a shorter, lower profile, and its valve covers are lower and flatter.
3. Intake Manifold:
* 4.3L: The 4.3L intake manifold is typically a single-plane design.
* 2.8L: The 2.8L intake manifold is often a dual-plane design.
4. Oil Pan:
* 4.3L: The oil pan on the 4.3L is generally deeper and more rectangular.
* 2.8L: The oil pan on the 2.8L is shallower and more rounded.
5. Identification Tag:
* Both Engines: Look for a VIN or identification tag on the engine block itself. It will list the engine's displacement.
6. Casting Numbers:
* Both Engines: There are specific casting numbers for the blocks and heads of both engines. These numbers can be found on the engine block and cylinder heads, and you can use a resource like a parts catalog or online database to find the corresponding engine.
Important Note: If you're unsure about the engine, it's always best to consult a mechanic or a reliable resource for accurate identification.
