I’m getting a 5.3 Vortec engine for a good deal I want to delete the AC Compressor my car doesn’t have AC don’t need it I want to delete any emissions crap on the engine I don’t need to make it fit I want to use the correct mounts I need the exhaust headers and the accessories belt drive just water pump alternator crank pulley and that’s it with a LS1 Oil pan and LS3 Manifold
So with that being said what do I need to do to remove all this stuff

 

Rotate the hardware fully counterclockwise

 

To remove what you don't want/need, you take off the bolts that hold it on and pull it away from the engine. In the case of a couple of emissions solenoids, you need to plug the port you opened up. Doesn't sound like you want power steering (the only thing that is run with the alternator/water pump), so after you remove it, cut the belt that was on the engine, have someone hold the tensioner at the mark, run the belt around the remaining pulleys, then cut the belt again to the proper length. Take that belt to the parts store and get a new belt that length.

An LS3 intake manifold won't fit 5.3 heads.

 

The AC compressor runs its own belt so you can just remove it. Power steering is more complicated but fits without an issue so I would keep it personally.

Emissions are easy enough to delete, you will need to either run an after market computer or have the rear o2 sensors deleted from the tune in the PCM. If you can find a LS6 intake it doesn't have the EGR, or use a FAST intake. You can also just get a block off plate for the EGR. You will need block off plates for the A.I.R injection or run headers without the A.I.R ports. If running the factory PCM you will need to have the tune set up to delete the emission monitors.

As pointed out the LS3 and most (if not all) 5.3's don't have the same ports on the heads so if you want an LS3 intake you will need heads or adapters. There is a good chart on this page of which ones have Cathedral Port vs Rectangle Port
https://www.hotrod.com/articles/late...gm-v8-engines/

There are several videos on youtube of people shaving the truck intakes to make them look better.

 

The head castings chart is incorrect. LQ4 & LQ9 had cathedral port heads.

Rectangular port heads have bigger intake valves, which don't play well with bore size less than 4".