I was wondering I have about 80 rounds of Czech ammo dated from 1979. While the round is not older than I am.  What type of concers should I have.   I know you can buy brand new ammo and have it blow up on you.  any oppionions?

Take a look at the ammo, you don't need a magnifying glass or anything, just a decent look over. See if you have any split necks or serious tarnishing (rusting if it is metal case).

Smell it.  It might smell slightly acidic, but if it smells really acidic then the powder and primer are breaking down.

Otherwise shoot it and enjoy.  I have shot ammo from WWI.  It depends on storage more than age.

I would treat is as corrosive and clean your rifle as such, but otherwise enjoy.  Czech ammo is pretty good stuff unless someone has left it sitting in an open field for tem years before you got to it.

A lot of surplus you get on the market today is that old or older.

Just inspected a box of Norinco Chinasports 7.62x39 and found 2 split necks out of 20 rounds.  If this common for 7.62 or any other ammo? First time I've seen it.  Was told by a firearms instructor to put unwanted ammo in a container with a little bit of motor oil to safely dispose of it.

The current batch of Czech is pretty good, and was in sealed metal tins in crates. Unless it was mishandled/hot/wet after opening, it should be fine.

I had a gift of 30 rnds on chicom copper wash ammo with my first SAR, about 10% were duds even though they looked good. My only chinese ammo so far.

Blueshocky.  With military surplus you will never know what you will find.  I would have to say that it is more rare in that caliber than any other, but not unheard of.  It mostly comes down to storage and handleing from the factory to you over the many years. I seem to find it most common with "colonial" made .303 british.  I shot up some Turk 8mm this weekend  that had about 20% split necks.  

For the most part, any new 7.62 X 39 should be in good condition.

Motor oil will do the job, if you could pull the bullet you could just disassemble it.A healthy shot of WD-40 to the primer will also kill the primer as well.