It ended up not being a crack. One shop pressure tested it up to 150 psi and it never leaked. Another shop told me it really only needs to be tested at 15 psi (because thats the radiator cap limit). However my thinking is that the first shop tested it up to 150 because it wasnt torqued down or heated up.
I put the head back on with a new gasket. The reason a lot of these posts are here.
I am still keeping an eye on the coolant level. Didn't notice any large drop in the recovery tank after towing my RV 400 or so miles. Will more than likely send in another oil sample.
On a side note, I did notice that the exhaust was still leaking a small amount under heavy loads. I could smell some pre-cat exhaust while slowing down a few times. I did use MLS exhaust gaskets and if i remember correctly the manifold surface wasn't entirely flat...so that's probably the source of the leak. I'll try those thicker FelPro exhaust gaskets if I cant sand down the manifold evenly.
