12mm Inconel 625 Head Studs for 991 Turbo

12mm Inconel 625 Head Studs for 991 Turbo

Our best 12mm Inconel 625 Head Studs for 991 Turbo!  We’ve changed materials for even stronger studs.

What do they fit?

• 2010-2013 Porsche 997.2 Turbo
• 2014-2016 Porshce 991.1 Turbo
• 2016-2019 Porsche 991.2 Turbo

Do they require machine work?

• No machine work is required
• Truly plug and play or drop in replacements for oem.

What are the torque recommendations?

• Settle at 15ftlbs, increase the torque to 30, 45, 60, 75 then final torque.
• Install Torque to 85-100 ft-lbs following oem sequence.
• Recheck at final torque in a linear sequence just to be sure you’ve not missed any!
• We loctite them in the case on install and use motor oil on the threads when torqueing.
• No need to re-torque later as yield is about 30% above actual torque.  So, there’s plenty of strength left in these beyond the recommended torque settings.

Why use Inconel if Chromoly could already hold tremendous power?

•  The alloys in these studs are so corrosion resistant, they’re polished vs. coated.
• The polishing also helps reduce any micro stress risers that could promote cracking down the road.

What are other advantages of this head stud kit?

• The 12 point 14mm allow a much easier install with a small socket which will clear the valve springs.
• The nuts are forged vs. machined.
• After stress testing these studs, the nuts spun on and off easily.  Even up to 130ftlbs!

Point is, they’re simply better…

Need help with the machine work or  Protomotive Porsche Engine Building

Here’s a fun video on Youtube showing our Head studs 🙂

And be sure to check out our Youtube Channel for some great tech videos!