Well I had an Engine builder ask if the intake runners in the heads were black and gummy? Sure enough it's pretty black and sticky. When I told him that Bullet said the cam should be at 109 and it is at 110.5, he immediately asked about the intake runners. He said it really sounds like it's getting a lot of exhaust reversion back in the cylinder and intake manifold. That could explain why when I first start it it seems fine and revs good but after about 2 minutes or so it won't rev smoothly. We are going to advance the cam to about 105 and put it back together. I will post how it goes whether it's positive or negative. Thanks again for all the feedback