S10/T10 Blazer 4WD V6-4.3L VIN W (1997)
7. Install the balance shaft drive gear but do not install the camshaft bolts at this time.
8. Rotate the camshaft so that the timing mark on the balance shaft drive gear is straight up.
9. Remove the drive gear. Turn the balance shaft so that the timing mark on the driven gear points down.
10. Position the drive gear onto the camshaft.
^
Ensure that the timing marks align.