Well I'm working on my eng. swap, but the other day I started thinking about this, even though it's a little to late to ask, Is it legal to swap a v6 or bigger eng. on your truck? I know a lot of people have done it, my concern is that when I have to go to the emissions, my vin # tells them that the truck I drive is a 4 cyl. right? And what if they set the computer for a 4 cyl. and I wont pass the test cause it's actually a V6 running on it. Do I have to get a state patrol inspection on it so that I have a certificate that proves that there is no stolen parts on the truck. But just in case I'm going to hold on to all my papers and certificates for a while. By the way I am having good progress on my swap. I will post some more pictures soon. Thanks for any input.