94 Excell, valve tap

If it's one valve and it's fairly loud, it may be a broken valve spring. I've had that happen on a couple of cars, so make sure you check carefully.

If you're comfortable adjusting valves, there's absolutely nothing you won't expect there.

In some cases, one of the bolts holding a rocker shaft down comes loose. The rocker shafts sometimes break. The threads in the hole are sometimes damaged. I've had to replace many rocker shafts and helicoil several heads.

That was EXACTLY what it was. The rocker shaft was loose on one side. I tightened the bolt and all is well. Of course I had already commenced on readjusting the valves before I noticed the loose bolt. I got away cheap this time.

Rob