Somebody on page 1 said I6's are more compact. That's the farthest thing from the truth, man. V8's are essentially as long as inline 4's, but they're alot wider. And width is not something usually lacking under any car's hood. The I6 is one of the longest engine configurations around, not to mention the heaviest.

I dropped an old 5.0 V8 from a Mustang into my old 240SX, and the front end of the car rose a few inches. That V8 was significantly lighter than the 2.4 litere KA24 that was in the car. V8's are light, too. New all aluminum units are even lighter.

V8's are also extremely revvy when they're breathing properly, more so than a inline 6. I think it's because they have double the displacement, but not double the weight. Less relative intertia, I guess.

So, since this page is about V8's vs V6's, here is what I think:

V8:

Lighter
Easier to package
Lots more power usually (unless they're the same displacement, which is rare) (ex: TVR 4.0/4.5 inline 6, I think those came on the Cerbera)

I6's:

Usually revvier, but again, depends on the V8 (E92 V8 comes to mind)
Heavier
Less vibration
More linear powerband

And I'd like to correct the assumption that V8's spend more fuel. Highway mileage, V8's are almost always more economical than I6's, usually due to way longer ratios.

V6's I find quite useless, to be honest. V8's are just a TAD bit bigger and have better characteristics.

Any other opinions? I'd really like to hear 'em.