I used to work a ton with bengals, and I am sorry to say, I really do not think he has any bengal in him. Usually they are spotted and they have very short thick fur, I have never seen a coat like it before. One cool thing is you can actually feel the spots in thier coat. It is hard to describe it, so if you get a chance go to a cat show and check it out! It isa very very soft and incrediably unique plush coat and VERY short. But I do think you have a beautiful example of what is called a classic tabby. They tend to have the bold swirling pattern (like a marble cake). Very pretty tabby. Also, I have never seen a Bengal max 13 Ibs. They average more like 8-10 Ibs in my experience. They are not very big kitties. Some of the big breeds include Main Coon, Ragdoll and Raggamuffin (new to the kitty world). But really, I would say you just have a VERY pretty classic tabby who is also a big kitty by chance. But Bengals also happen to be pretty wild kitties, hard for many to manage. So, maybe you are lucky that he isn't.