Not that big of a groove. You might wanna pull all the valves and fittings outta the head and check 'em for broken springs etc. Looks like that had to be a fairly large chunk at one time.
" But let me tell you something ,folks: You can't fix stupid!
There's not a pill you can take, there's not a class you can go to. Stupid is forever!"
" Pay no attention to that man behind the curtain!