Headstuds

[JeweDY]

Hello what would be the best headstuds if you're rebuilding your porsche engine Thank you

[69 911s]

Supertec.

[PeteKz]

Need more info about your build and its purpose. Supertec head suds are great, but expensive overkill for most uses, unless you are building a real race car. Porsche steel studs are sufficient for most purposes.

[Neil Harvey]

Originally Posted by PeteKz

Need more info about your build and its purpose. Supertec head suds are great, but expensive overkill for most uses, unless you are building a real race car. Porsche steel studs are sufficient for most purposes.

Would be great to understand what you are saying?

How does a head stud know its in a race?

The use of good fasteners has nothing to do with racing.

[69 911s]

Originally Posted by PeteKz

Need more info about your build and its purpose. Supertec head suds are great, but expensive overkill for most uses, unless you are building a real race car. Porsche steel studs are sufficient for most purposes.

I completely agree but he simply asked which are best and I shared my opinion. Supertec studs aren't going on every engine I build but they are on the ones that are built well outside of factory performance parameters.

[PeteKz]

Originally Posted by Neil Harvey

Would be great to understand what you are saying?

How does a head stud know its in a race?

The use of good fasteners has nothing to do with racing.

Okay Neil, let's turn your question around. Why use more expensive head studs if the Porsche steel ones already last 200,000+ miles? What constitutes "overkill?"

It's a serious question, because cost is always a consideration.

[Henry Schmidt]

Cylinder head studs are about creating the most consistent cylinder/head platform [stability] no matter what the intended use.
Supertec is a good choice for those interested in improved design features.
Precision ground, heat treated, rolled threads
Quality corrosion resistant aged 17-4PH steel
Better expansion rate than stock steel
More consistent clamping force than nonsensical Dilivar
Fine thread for more precise torque and force retention
Highest quality (12.9), 12 point serrated flange nut [allowing nut to spark plug clearance when twin plugging]
Ground and hardened washers
Additional threads at case end for more engagement [important for non-inserted mag cases]
Longer over all length for custom rod length applications
Ease of engine assembly
No need for height adjustment
Piston can be installed without the stud interference.
Price includes studs, nuts and washers. No need to reuse the ridiculous Porsche Allen head nut.

[69 911s]

Originally Posted by Neil Harvey

Would be great to understand what you are saying?

How does a head stud know its in a race?

The use of good fasteners has nothing to do with racing.

A head stud knows it is in a race because it usually sees a rebuild in under a hundred hours where a street engine properly maintained can go well over a hundred thousand miles. The environment on the race track is completely different in terms of heat cycles, stress and just basically hitting redline between nearly every shift which is just not feasible on the street. Kinda like the way race brake pads can't even get into their engineered heat range on the street.

[JeweDY]

ARP sounds like the one to use I have my mechanic doing the work and I have to buy the parts. Any recommendation where to buy the parts

[Turbo_pro]

Originally Posted by JeweDY

ARP sounds like the one to use I have my mechanic doing the work and I have to buy the parts. Any recommendation where to buy the parts

Why?

[stownsen914]

Have a read on ARP head studs. No experience with them personally. I do use other products of theirs and believe their stuff is good in general, but feedback I've seen on their 911 head studs has been mixed

[Jeff Alton]

Originally Posted by JeweDY

ARP sounds like the one to use I have my mechanic doing the work and I have to buy the parts. Any recommendation where to buy the parts

Why is your "mechanic" having you buy the parts? Does he not have a recommendation and relationship the vendor who will supply them?

[mepstein]

Usually you want your mechanic to pick the parts that they are comfortable and familiar with, not make their choices for them. For example, my painter has his favorites for what the job requires; cost, time, labor, etc. If I'm choosing his materials, he's not my painter, just the guy spraying paint. My engine tech definitely has a head stud preference. It's based on a hundred + builds plus the experience of another engine builder with a couple thousand builds. Not to mention your builder should be able to buy wholesale, not retail.

[Billthebuilder]

Tough crowd just reuse your old ones

[Turbo_pro]

Originally Posted by Billthebuilder

Tough crowd just reuse your old ones

What if your engine has the original Dilivar studs? Like 3.2 Carreras with steel studs on the top and old style Dilivar on the bottom?
In general, "just reuse your old ones" is a ludicrous decision.
Every rebuild should be treated as a unique opportunity to build something special.

[PeteKz]

...except Dilivar!

Realistically, you can reuse the OE steel head studs if they are not significantly corroded. If they have any more than surface corrosion, you should consider new ones, because the pitting will eventually lead to "stress corrosion cracking." Those pits cause stress concentration,just like a sharp machine edge or other sharp points. The stud is under constant tensile stress, but that stress also varies due to thermal cycles. The largest changes are due to start up and shutdown, but there are also variations in stress due to operating at different power settings. Therefore, eventually, cracks may propagate through the stud and crack it.

Bottom lines: If in doubt, replace it. Otherwise, you can reuse the steel studs. I personally like to clean them and epoxy paint them to help prevent future corrosion.

Those of you building and running race motors, do whatever works for you.

[stl87]

Scammer. Answered my WTB post, ghosted me when I asked for more pictures and where I can come see them

[540964]

Is Raceware a good choice?

https://lnengineering.com/products/aircooled-porsche-parts-and-upgrades/raceware-porsche-vw-hardware-and-fasteners.html

[540964]

Is Raceware a good choice? Sorry double post

https://lnengineering.com/products/aircooled-porsche-parts-and-upgrades/raceware-porsche-vw-hardware-and-fasteners.html

[Geneulm]

Absolutely