Name That Engine Shaving!!!!

[NewfoundlandDude]

Well, not really a shaving, but a broken piece in the pan.

I broke another rocker arm last night.
This time, half of one leg broke off, and the broken part continued to open the valve.....so no loss in performance. It started ticking though....almost like a loud ass lifter tick. I checked the oil, and added just a little, but no dice.

This morning I pulled the valve cover, and sure enough, another broken rocker arm.

I found the broken leg in the pan, along with the valve shim.
But I also found an aluminum bit.....which I need help identifying.

This rocker was #1 exhaust (closest to the front), so I assume that it broke and both pieces fell down through the timing chain spacing.

Somewhere between the head and the pan, it broke this wedge shaped piece of aluminum...and I need to find out where.
It broke on the thick end of the wedge.

Here's a pic of what I'm dealing with.
Obviously the large part of the rocker was placed in the pan by me.
Can anyone think of what the aluminum bit is?
Thanks.

Edit:
There's also that small sharp brown/black tinted bit that you can see in the pan!

http://i204.photobucket.com/albums/bb101/Puddincole/IMG00279.jpg

http://i204.photobucket.com/albums/bb101/Puddincole/IMG00281.jpg

http://i204.photobucket.com/albums/bb101/Puddincole/IMG00282.jpg

http://i204.photobucket.com/albums/bb101/Puddincole/IMG00283.jpg

http://i204.photobucket.com/albums/bb101/Puddincole/IMG00278.jpg

http://i204.photobucket.com/albums/bb101/Puddincole/IMG00284.jpg

[fliprayzin240sx]

Jeez...looks like you're a prime candidate to go solid lifters...

[BigVinnie]

Another reason why the sr20det valve train sucks compared to RB, CA, KA valve trains.

[Homer_Simpson]

Hit that macro button man, its that button with the flower on it.

As for your bit of aluminum, it looks like that little spike that is on the inside of the front cover. IIRC, its function is to hold up the timing chain so that it won't fall off the sprocket on the crank snout.