Do a valve job.
This is more complicated than it sounds, you might be better off sending the head to your local machine shop for the valve job.
its more likely to be the intake gaskets.
side of the throttle body to your right facing the engine
The EGR valve is located in the center of the intake, at the front of the engine, between the alternator and the A/C compressor. I've added a picture of the location under "Links". It is titled "Picture of EGR valve location, on 1996 - 2001 4.3L (262c.i.) Vortec V6 engines"
On a 1996 Chevy Camaro, the PCV valve is located on the right side of the valve cover. There is a hose that runs from the PCV valve and connects to the back of the intake manifold.
in the low side hose by the condenser
1996 Chevy blazer timing chain
my Chevy blazer power seat on my 1996 Chevy blazer isn't working
what is the distributor setting for a 1996 Chevy blazer
It is in the middle between the intake and the water pump.
what arethe 3 relays in the glovebox on a 1996 chevy blazer
What is your 1996 Chevy blazer LS with a blown motor worth?".
A 1996 Chevy Blazer Does have a transfer case IF it is equipped with 4 wheel drive