The terms "small block" and "big block" are primarily used to differentiate between engine families produced by specific manufacturers, like Chevrolet or Ford. They are not universal terms that apply to all engine types.
Here's why there's no clear-cut cubic inch threshold:
* Engine families have different displacement ranges: For example, Chevrolet's "small block" V8 engines range from 262 cubic inches to 400 cubic inches, while their "big block" V8 engines range from 348 cubic inches to 572 cubic inches.
* Engine designs vary: The terms "small block" and "big block" refer to the overall size and design of the engine, including the bore spacing, crankshaft design, and other features.
Here's how to determine if an engine is a "small block" or a "big block":
1. Identify the manufacturer: Different manufacturers have different definitions for their "small block" and "big block" engines.
2. Research the engine family: Once you know the manufacturer, research the specific engine family to determine its designation.
3. Look at the engine's physical characteristics: The overall size and features of the engine can help you determine its classification.
In summary: Don't rely on cubic inch alone to distinguish between "small block" and "big block" engines. Focus on the manufacturer, engine family, and physical characteristics.
