[Tomahawk30]

Originally Posted by 72chevydump

To check for this do I still need to pull the head or can I check while it's still on the truck?
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Full disclosure: I'm a crappy mechanic. But the broken spring is just one of those things I've run into and worked through on my own. And one of the few things that turned out to be GOOD news as it was a really easy fix!

You just need to pull the valve cover to check the individual springs. Not sure if this has anything to do with it running then dying, but without the pressure of the full spring pulling the valve upward, that valve will fully seat and that cylinder has no compression. I actually found the broken spring on mine after I'd done a compression check and had no pressure at all on that cylinder. The broken spring made that valve pretty darn noisy. Again, no clue if this is even the right track, but if you have the valve cover off it isn't hard to take a second and look all the springs over just in case.