Hi Guys: I have tried everything to loosen up my frozen 54 engine in my 49 1/2 ton. I plan to start looking at the interds. When I take off the head, do I need to remove the rocker arms or can I simply loosen the head bolts and leave the rocker arms in place? Will this procedure make life easier if I get the engine moving and start replacing everything???...any potential harm by doing it this way?