OK, Bought a 07 with a couple problems today.

[SpareParts]

I had low pressure on my 5.3 with 180k miles. So I dropped the oil pan and replaced the o ring on the oil pick up tube. Increased oil pressure when hot from 15 to 25 at idle and from 25 up to 45 at 2500 rpm.

Did you see Post #31?
My guess is cam bearings are chewed up.

 

[SpareParts]

As you can see the oil press sensor is conveniently located at the back of the motor and easy to access (as long as the motor is out).

Be sure to use an OEM sensor in there from a reputable source. The market is flooded with offshore counterfeit crap. You don’t want to replace that buggar after the motor is in. It’s a blind reach and a PITA.

Yes everything is from Rock Auto and GM, ACDelco, Felpro. You get the idea.
Nothing from ChingChong China. I only use name brand, where they get it from i can't control.

 

[blondie70]

When my engine was out for the cam job, I installed a 1 foot grease gun hose for the oil pressure sensor. Got fittings off ebay. Now the sensor lies up close to the purge valve alongside the intake manifold. No problems changing that baby now ! The mechanic extended the wiring for it. Grease gun hose rated for 5000 psi or somethng like that. Working good.

 

[SpareParts]

That would sure work. Im installing a new one with the wrecking yard engine.
I also do not believe the old one is bad.

 

[mikeyss]

I actually did check on them as i had never seen them.
Are you thinking the 823 heads that are known to crack if they have a casting mark that looks like a battery?
As far as i can find reading 5364 heads are as good as the other two casting number heads you normally find on 6.2L engines.

I have tried to find where I got the info on the 5364 heads being problematic, but I couldn't find it anywhere. Therefore, I guess it looks like I'm wrong.