Buick V6 Oil Pan Photo Guide
The early oil blocks (i.e. pre mid-year 1985) were all 14 bolt oil pans. After that, they were 20 bolt oilpans.
Stock OIl Pans
Aftermarket Oil Pan
OIl Pan Baffles Pattern -
Small version (for screen display)
LARGE detailed blueprint ... download (right click and Save Image As for printing)