340 identification

I find that a lot when looking at older cars and trucks. If it has a V-8 most people will try to tell you its either a 340 or 360. Most of the time I think it is just because they don't know. If I can prove its a 318 than I allways try to get them to drop the price between $200-$500 depending on the vehicle. Good thing that hasn't worked for me yet other wise I would have a crap load of 318's laying around.