ticking like sound

So I fired up the motor with the new heads and cam. As soon as we started the motor we got a ticking noise on the drivers side. Sounded like a rocker, but we shut it off and re adjusted everything, then re primed it and it still did it, so We broke the cam in. We figured if it was the cam going bad it would only get worse not better. So we broke the cam in and had a constant 60-55 psi of oil and the water temp stayed under 190 the whole time. We did however tighten the exhaust bolts a little and it did go away a tad, but we cant tighten them anymore and its still there.. This sound is only coming from one side and when using a long piece of wood to listen to the rockers, they all sound the same on all sides. Keep in mind this is a solid tappet cam. Im not totally sure what it can be, Im hoping just an exhaust leak or something. its a 360 with a comp 306s magnum cam