as a rule a odd firing is a v8 with 2 cyl cut off. so there is a gap. pop pop space pop pop space pop pop space.
a even fire is where it was a v6 to start with. and the spacing it even so it just goes pop pop pop pop pop pop.
and a alfa is a real v6 so it is even fire
An even fire V6 has a power stoke every 120 degrees of crankshaft rotation. The cranks are single pin design meaning that each connecting rod has it's own crank journal. An odd fire alternates between 150 and 90 degrees of crankshaft rotation for each power stroke. Odd fire cranks have dual (or siamesed, common, tandem, etc.) crankpins meaning that two connecting rods share a common crankpin.