The M30 engine was made in many sizes. Approximately, these included: 2.5 liters, 2.8 liters, 3.0 liters, 3.3 liters and 3.5 liters.

The M30B34 engine is (approximately) 3.5 liters (though it’s closer to 3.4 liters, technically.)

Due to its larger displacement, it tends to more powerful.

The North American version has an 8 to 1 compression ratio, which is very low. This makes it very forgiving as to what octane gasoline it can burn.

This particular engine also has exceptionally good internal coolant flow, better even than the M30B35 engine that superseded it. All other things being equal, this makes it more reliable.