Some companies actually don't guarantee you will have oil pressure after they build your motor(does yours?). I know HPE guarantees you to have oil pressure and i trust them fully with my motor (iron 398 built for 1500 hp). Call Erik at HPE and ask him what bearings they use(either clevite or federal i am not sure) so you could possibly fix the problem if it is bearing related.
Greg

 

Thanks Greg and we just now are finally getting our blocks (and yours!) from GM!

But seriously there is no difference on the cam bearings from the iron 6.0s to the aluminum blocks that I have ever seen? Basically quite a few shops don't really check bearing clearance because I have seen some engines with HUGE clearance. PLUS if anything the iron blocks will keep and hold MORE oil pressure with heat than the aluminum blocks will due to the clearances not opening up so much like they do on aluminum blocks when hot.

We have had basically NO problems with the iron stuff EXCEPT getting the blocks here in the first place!

 

I hope there aren't gunna be any problems with the blocks b/c I'm gunna order one from scoggin dickey tomorrow(if my damned debit card comes in).

 

I hope there aren't gunna be any problems with the blocks b/c I'm gunna order one from scoggin dickey tomorrow(if my damned debit card comes in).

 

No problem with ours and we also guarantee our engines. As long as you add oil

 

The problem is probly simple but fixing it it a major deal.First LS1 engines can't be primed before starting,so chances of a dry start bearing failure is hi. If oil presure was good at first you can rule out plugs left out.Next posible cause is oil pickup and location if its not located just right it will suck air into the system,Running it low on oil will look the same.Regardless it all has to be torn down.Remember if your going to play sometime you have to pay.I recomend you find someone local you can trust to do a good job,and if your going to race it let them know so they can give you some exta clearance.You can be in spec and still be to tight.Thats what 20 plus years as a engine builder has tought me.

 

MY '04 6.0 is holding up great. 31,000 miles. On my second cam right now, possibly doing a third this spring.

I've heard of one other stockish 6.0 that lost it's cam bearings. Benkey (occasionally posts on this site, but more on silveradoss.com). He lost a cam bearing or two or three, after his third cam swap. He ended up getting the whole motor rebuilt.

From what I've read (over multiple threads on this in the truck secions and other truck sites) the oil pressure on almost all of these newer 6.0 factory truck motors all have somewhat low oil pressures. Mine is around 35psi at idle, and 45-55 at speed, which seems to be normal.

I know this doesn't relate to the built motors, just putting the info on the table.

 

My 6.0L block is running .080 over to 7200 rpms with stock cam bearings, never had any problems with oil pressure.

 

I am currently building a 408. I have a magazine somewhere that has an article about how the 6.0 block has two different size cam bearings. One size for the early blocks and another for the later blocks. I plan on contacting clevite and asking them.

 

I am getting 60psi in my 370 at idle. I see 70psi while i am driving.