Replace the failure prone stock bolts before it's too late!
Do a quick search and you will see far too many threads discussing this issue which has plagued countless S54 owners.

Problem: The stock cam gear bolts can back out and completely shear causing catastrophic piston to valve contact.

Solution: VAC S54 Cam Gear Bolt Kit
Our S54 Cam Gear Bolt Kit has been specified to replace the 'almost guaranteed to fail' stock bolts that fasten the cam gears to the camshafts.

Kit includes:

(12) 12.9 uprated inner bolts
(12) 10.9 outer bolts
(1) tube of Loctite which is required for installation.