I acquired my 1991 Camaro in a non-running state. The 5.3L truck engine was installed as well as a 4l80e transmission but the PCM and wiring harness was missing and there are a number of open vacuum ports on the manifold, throttle body and valve covers. If anyone can help me identify what all of these open ports are supposed to be connected to, that would be extremely helpful.

BTW, there already is a large hose running from the vacuum brake booster to a port on the very back edge of the intake manifold so that is one vacuum port that is already connected to something.

Two barbed pipes, one plastic barbed pipe on very front edge of the plastic intake, and another metal pipe on the edge of the throttle body. But directly behind those two pipes is a large hole with the threaded boss right next to it.

Metal pipe on the edge of the valve cover underneath the upper edge of the coil pack on the passenger's side of the engine.


Open rubber hose sticking out underneath the driver's side of the throttle body.

Open metal pipe on the rear edge of the driver's side valve cover.

Large plastic barbed pipe on the top center of the truck intake manifold. This points over to the driver's side fender well of the engine compartment.

 

Pic 1: the nipple on the manifold goes to the PCV valve/orifice, on the driver's side valve cover at the rear, in pic 4. The one on the TB goes to the PCV makeup air port on the pass side VC front in pic 2.

Pic 3: goes/went to the steam port that now has that thin stainless braided hose hooked up to it. The corresponding one on the other side of the TB goes/went to the coolant bottle. The steam ports being connected to the TB heated the TB up. Some people like to think it makes their truck faster if they bypass that TB heat to let the TB stay cool. You can do away with the cut rubber hose and leave the sodomy less obvious. The coolant bottle in that setup is pressurized and the braided hoses need to end up there. They can go to a few other places if you're creating pressurization some other way.

Pic 5: has to do with the evaporative emissions system.

Looks like a fairly early 5.3; like 2000 or older.

 

Thanks for those answers but what is this hole on the top of the intake, just behind where the throttle body bolts on?

13mm hole with threaded boss just behind.

 

An evap emissions device goes there.

I just told you where that motor came from. You'd do better to just go to the local buzzard nest and LOOK AT one, than continuously posting on the Internet about it.