* Engine Block: The most common location is on the side of the engine block, usually on the passenger side, near the front. It might be on a flat area, or slightly recessed. Look closely – it's often cast into the metal, so it might be faded or worn. The number itself will be a series of numbers and possibly letters.
* Intake Manifold: Sometimes (though less common), a partial or complete engine number might be stamped on the intake manifold.
* Valve Covers: While unlikely to have the *full* engine number, valve covers *might* have casting numbers which, when cross-referenced with a Mopar parts catalog or online resource, could help identify the engine.
Challenges and Tips:
* Cleanliness: Engine grime and corrosion can obscure the numbers. Use a wire brush, degreaser, and a good light to clean the areas you're searching.
* Accessibility: The engine bay can be tight. You might need to move some hoses or other components to get a better view.
* Multiple Numbers: There are other casting numbers on the engine block and related parts; these aren't the engine *serial* number, but they'll identify the block type, heads, etc. Don't confuse these with the engine number.
* Online Resources: Websites specializing in Mopar parts and restoration (like forums dedicated to Plymouth GTXs) can be incredibly helpful. Knowing the casting numbers you *do* find will help others assist you.
* Professional Help: If you're having trouble, a mechanic specializing in classic cars or a Mopar enthusiast may be able to locate it for you.
Important Note: The engine number is crucial for verifying authenticity and originality in a classic car. If you're buying or selling a 1967 GTX 440, this number needs to be documented carefully.
