this guy has a rv cam and header together for $100. is this worth it. what are the advantages of this cam?

 

Depends on the size of the cam. Some claim gains at lower RPMs, others at higher. Is it used? Why is he selling it? It would be a good deal if it was new. What kind of header? More details would be helpful. I read somewhere that any cam bigger than a 272 will throw off the computer.