If the exhaust rocker doesnt move at all when the ball rolls underneath it, the rocker going to need replaced, possibly the cam as well, I would say next thing to do is drain the coolant, remove the thermostat housing and cam cover. We need to check the release rod. I have seen the rod inside the cam break once on an aftermarket cam set up, and have seen wear on the rod that would lessen the travel of the ball too. This part you wont be able to see with just the valve cover removed. More covers need removed to see it. As far as setting the valve clearance, just make sure the rocker arm is not on the lobe of the cam, at all, and the exhaust isnt on the ball. Set it to .006 and you should be fine.

 

Hi, I hope you're well, and still able to help me!! I've finally got around to getting the release rod, I took it out and it looks fine, apart from a very small amount of wear at the very end (I assume this is where the ball rolls around it) the cam itself doesn't look worn at all, all three lobes appear to be the same height! Any thoughts on what my next move is!? Again really appreciate all your help.