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What in the heck is this for, if I remember correctly it mounts on the driver side head wit the round part sticking up like its protecting you from the end of the fuel rail when it blows out.

My 2011 Silverado 5.3 with 260k miles Codes: P0172, P0175, P0300 Work completed in the last 1.5 years: -Heads Rebuilt by Crazed Performance -Lifters inspected, no issues at the time -Injectors Replaced -Evap: Charcoal, Gas Cap, Purge Valve all Replaced (last month) -Coils, Plugs, Wires For the passed 1.5+ years the truck has been throwing random misfires that we haven't been able to resolve. Recently, the truck has been hardly drivable at higher loads like uphill especially. You could mash the pedal and the vehicle had zero response. I am suspecting that the catalytic converts are bad/clogged causing either back pressure, or a problem o2 readings. Longterm fuel trims -18% to -30% I am leaning towards bad cats, but I'm a little confused because I haven't received any cat efficiency codes p0420. I measured the temp of the cats: approximate temps (F) Driver Side: Inlet: 400 Outlet:600 Passenger: Inlet: 400 Outline 500 3rd cat Rattles: Inlet 300 Outlet 300 (No sensors) ECT for this chart is 190+ the entire time It's worth noting that the engine was cold here, and hit about 190 when the I got on the gas in the shaded region causing misfire/rich codes

Ok, so about a month ago I had a AFM lifter get stuck on my 2011 Avalanche and went through the process of the VLOM mod and that all went well and is perfect. When i had it torn apart, I could tell that the previous owner(s) didn't change the oil at proper intervals as both valve covers and the bottom of the VLOM were completely caked in old dried up nasty oil and carbon. I cleaned all of them up in my parts washer, and when the VLOM mod was done, I used a bottle of liqui-molly engine flush and changed the oil and all is good. While I was performing the lifter release, I noticed that my pushrod and rocker arm had some pretty decent wear so I decided to replace all the pushrods and rocker arms. To my surprise, all but 4 pushrods and rockers had pretty significant wear on them. I would have never thought that most of them were that bad as this truck runs smooth, no misfires, and no ticks. But after I replaced them, I noticed a substantial increase in throttle response, and my brake pedal is more sensitive now as I'm assuming it's pulling more vacuum from the valves being able to fully open now. Not sure if this info will help anyone else, but if you see damaged pushrods, I would recommend replacing them and the rocker arms. Here is what my pushrods looked like.