What is Chevy head 3998997?

The Chevrolet head casting number 3998997 is for a small-block Chevy (SBC) cylinder head. It's a common head found on several generations of small-block V8 engines, but its exact specifications (like valve size, chamber volume, etc.) depend on the specific year and application of the engine it came from. You'll need more information to pinpoint the exact details.

To get more precise information, you would need to know:

* The year of the engine: The design and specs of this casting number may have changed slightly across different model years.

* The engine's displacement (e.g., 350 cubic inches): Even within the same casting number, different size engines might use them with slightly different components.

* The vehicle it was in: Knowing the make, model, and year of the car or truck will help determine the engine's specifications.

With this additional information, you can find detailed specs online through resources dedicated to Chevrolet small-block engines or consult a parts catalog.