Pelican Parts Forums - Lower head bolts, not studs

Quote:

Originally Posted by Henry Schmidt (Post 12022761)

I've never seen this modification but necessity is the mother of Rube Goldberg or for you younger guys, MacGyver.
My questions would hover around bolt expansion rate, thread pitch and Case Savers.
Is it possible that the case was tapped to fit a core thread American bolt? yikes!

There should never be two different expansion rates between upper and lower studs.
"But the factory did it" ...sure, and that was just one of their many mistakes surrounding the 911 head stud issue.

Yeh I was wondering where he sourced these Allen bolts from that would fit the case threads. I’d imagine they’re harder to find than Porsche studs. I’m sure surprises await when the tear down happens.