Where was the serial number located on engine of a 1978 trans am?

The serial number on a 1978 Pontiac Trans Am engine wasn't in one single, easily accessible location. It depended on the specific engine (e.g., Pontiac 400, Oldsmobile 403, etc.) and whether it was a cast-iron or aluminum block.

Generally, you'd need to look in several potential areas:

* Top of the engine block: This is a common location, but not guaranteed. Look near the cylinder head, often on a flat surface.

* Side of the engine block: Check both the driver's and passenger's sides of the block, usually near the lower portion.

* Engine casting: The number might be cast directly into the block itself, possibly obscured by grime or paint.

To find it reliably: You'll likely need to consult a 1978 Pontiac Trans Am service manual specific to your engine type. The manual will give precise diagrams showing where the engine identification number (VIN) or serial number is located for that particular engine. The engine casting number itself isn't the serial number, but it's useful for identifying the specific engine. The actual serial number would be a separate alphanumeric string.