Hey everyone, can someone explain what a 2V is when it comes to Mustangs?
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The 2V refers to the number of valves per cylinder in the engine. For Mustangs, this was the standard until the Cobra models switched to 4V engines starting in 1996. The 2V engines, like the 4.6L in the GT, had 2 valves per cylinder, whereas the Cobras had 4 valves per cylinder, making them look and perform differently.
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Yeah, the 4V heads are definitely noticeable, they’re larger and give the engine a cooler look, in my opinion. Then, in 2005, Mustangs switched to a 3-valve setup for a while. It wasn’t until 2007 with the GT500 that the 4V design made a comeback, pushing out 500 HP! 
By 2011, the GTs moved to the Coyote motor, which is also a 4V design. So now, there are no more 2V or 3V Mustangs.
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Exactly, and for Camaros, it’s simpler, they all use 2V pushrod engines, unlike the Mustangs which had various setups over the years.
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To add a bit more detail, back in the day, the “v” in 2V or 4V originally referred to the number of barrels on a carburetor. But now, it just tells us the number of valves per cylinder. So, a 4V engine allows more air and fuel in, which means more power. 
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That’s right. More valves generally mean better performance, especially with turbo setups like the 2003/04 Cobra had. The 03 Mach 1 also had a 4V engine, which was a beast.
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Just to clarify, a 2V engine has one intake valve and one exhaust valve per cylinder, while a 4V engine has two of each.
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And with the transition from overhead valve to overhead cam engines, the number before the “V” tells you how many valves are in each cylinder. So, 2V = 2 valves, 4V = 4 valves.