1. Displacement (Cubic Inches):
* 327: Has a displacement of 327 cubic inches.
* 350: Has a displacement of 350 cubic inches.
2. Bore and Stroke:
* 327:
* Bore: 4.00 inches
* Stroke: 3.25 inches
* 350:
* Bore: 4.00 inches
* Stroke: 3.48 inches
3. Casting Numbers:
* 327: Look for casting numbers on the block that start with "378" or "391".
* 350: Look for casting numbers that start with "396", "397", or "416".
4. Valve Cover Bolt Pattern:
* 327: Has a 5.700 inch bolt circle on the valve covers.
* 350: Has a 5.938 inch bolt circle on the valve covers. This is a more common bolt pattern for other Chevy engines.
5. Oil Pan:
* 327: May have a different oil pan than a 350. Some 327s used a pan with a large "bump" on the front. However, this is not a foolproof indicator.
6. Intake Manifold:
* 327: May have a specific intake manifold designed for the 327, but this is not always the case.
7. Other Visual Clues:
* 327: Often found in older vehicles (1962-1968) and may have more traditional engine designs.
* 350: More commonly found in later model vehicles (1969 and later).
Important Note: While these clues can be helpful, it's always best to confirm the engine size by checking the casting numbers or a vehicle identification number (VIN) decoder.
