About a month or so ago, I started my truck and had no oil pressure. I shut her down and checked a few things under the hood. I said to myself "lets go for broke" and restarted. Again, no oil pressure. After about 5 or 10 seconds the oil pressure came back but now the engine was making much more valve train noise (even more than normal with my cam).

Today I decided to take her apart to see if I could find out. Well as you can see, I now know for sure. Nearly every lobe has wear on it. Some are worse than others but all are affected.

I did not take the heads off but I am sure all the lifters are toast as well. I am in the process of looking for a low mileage 6.0 to replace. I have already spoke with Patrick G about a cam choice and I am pretty sure I am going to with an EPS grind (which he collaborated on the lobe designs) of 222/226 112+4. He explained to me this cam would behave like the cam I currently have in my 5.3. He is thinking it would have the potential to make 380 RWHP and 380 RWTQ with my combo and an otherwise stock LQ4.

My question would be should I just bolt the cam (and springs/push rods) in the 6.0 or should I upgrade the oil pump and timing chain as well?

 

I would not put any new parts in that engine with out takeing the engine completely apart first!!! All that metal had to go some were and its probally embeded in the bearings!!! There is also a resaon it originally lost oil pressure. I would not be supprised to find a spun cam bearing or something else wrong with that engine.

 

I have no plans to do anything with the engine. Its apart now and will continue the process of removing the transfer case, transmission, exhaust, headers, etc tomorrow. The engine has served me well and before this, everything was fine. I have no idea why the engine lost pressure. All I could find is that the relieve valve in the pump could have remained open, allowing the pressure to bleed. I do not think it is all that common but I could find it on the net when researching.

 

All though it is rare that could be a possibilty of why you lost pressure. But now that the damge is done the rest of the motor is contaminated.

I have Also heaard of a few people spining the cam bearings and loosing pressure.