5.3 Liter question

[Ummgawa]

I have a 5.3 Liter in my Chevrolet truck, best vehicle I have ever owned. I was driving it today and out of the blue the valves started clattering and the oil pressure dropped. I whipped into a parts store, checked the oil level, perfect. Got back in the truck, refired, quiet as a church mouse.

Driving it home, did it again. pressure dropped, clatter, stopped, refired, nothing.

Motor about to take a dump? 250K miles, I have put every mile on it. I like it better than my other truck and hate to see it crap out. It has been meticoulously maintained, but I guess every dog has it's day.

Anyone here have a same LS based problem like this?