Chevy 2.8L timing?

The timing for a 2.8 V6 is typically 100 BTDC.

The deep notch on the timing gauge is 0* or TDC. Each peak on the gauge is 4* thereafter. There are three slots or grooves on the harmonic balancer. One for each pair of cylinders. One of these timing marks are wider than the other two. That is the timing mark for cylinders 1 and 4.