I just replaced the balancer on my 350 with a OEM style. The new one has 2 timing marks because they said chevy located the marks differently through the years. But when I compared the old with the new one using the key slot for orientation the marks were not even close to the original. What is wrong here. I have not started the engine yet. Maybe a week away.

Most all after market balancers are designed to use with the type of timing tab that you bolts onto the timing chain cover. They are pretty cheap at about all auto supply houses. If that doesn't align, then something is mismatched.

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79 Z28 Bought new, honeymoon ride, same wife, same car.

Your outter ring on your stock damper problly slipped. That's pretty common on older stock dampers.

If you look, the damper is 3 pc.

You have the center hub, where the keyway is and the 3 pully bolts

Then you have a ring of rubber

the you have the outter metal ring

The only thing holding the outer ring to the inner hub is the rubber.

If the rubber gets old, cracked, dry rotted, etc, the outter ring can slip

Now that the timing mark is on the outter ring, if it slips it will be in the wrong place

Thanks for the reply. I figured that is what happen but the car idles and performs good. Because of the mark moving thought it would run crappy.

The mark moving will do nothing to your power.

That mark don't controll what your timing is, it's just a mark so you can check timing. Just something to line up with the #'s on the tab.

It moving around is never a good thing though, you cant set your timing right anymore when it moves, and the outter ring could fly off, if it moved