Ford 2003 Mustang Workshop Manual page 1699

6. Install the special tool.
7. Install the camshaft spacer, washer and bolt and hand-tighten the bolt.
8. Install the camshaft sprocket, washer and bolt, and hand-tighten the bolt.
9. Tighten the bolts in two stages:
Stage 1: Tighten to 40 Nm (30 lb-ft).
Tighten an additional 90 degrees.