Raceware head nuts
 

Looking at my stock head nuts the hex head on some are a bit rounded and I'll need to replace some, maybe all. Raceware looks like a good option. Are these made of steel? Anyone have/had issues with these? I assume the stock washers will be OK with the Raceware nuts?

Look at the 993/964 head nuts, the washers are built in.
Bruce

As a past RaceWare dealer, we found the quality to be somewhat inconsistent.
We've got a barrel full of those ridiculous Porsche heads nuts. Washers too.
How many do you need?

That may have answered a topic I though of posting. I used to be on this board in the '90's under a different user name, I left for a number of years and when I came back my account had been deleted. Anyway back then Raceware was the king for head studs on this board, I had wondered why they are not mentioned here any more.

If Raceware quality is inconsistent, and Porsche head nuts are ridiculous, what's the latest and greatest?

JB

Just to be fair, I said "we found the quality to be somewhat inconsistent" and that was many years ago. They (Raceware) may have cured those issues by now.
Those inconsistencies were one of the main reasons we decided to design a completely new stud.
The Supertec head stud is the only stud on the market that offers a modern design and material along with a life time warranty.
Available from our host.
BTW: the head nuts will never be difficult to remove and the studs install with no need to measure the stud height.

Does the Supetec stud have "dilavar-properties", mimicking the expansion rate of aluminum?

The Supertec head studs have an expansion coefficient designed to promote cylinder to head stability. It was design by a stud engineer with no vested interest in anything but applying engineering principles to a specific set of conditions. Not price, not warranty issues and certainly not justifying past mistakes.
No other aircooled engine builder has deems Dilivar to be the appropriate material to use as a stabilizing element for use in there product dynamics.
No motorcycle companies of which there are many, no aircraft manufacturer, no turbine engine builders.
Why is that? Perhaps the material is unreliability from an engineering stand point and is far too unpredictable.
The very properties that Dilivar espouse are the same properties that make them unreliable?
Ever had a stuck head nut on a Dilivar stud? YES Supertec NO
Ever had a Porsche head nut strip? YES Supertec NEVER
Ever had a broken Dilivar stud? YES Supertec NEVER
Ever have an issue with head nut clearance with Porsche head nuts on a twin plug conversion? YES Supertec NO
Ever had an improperly installed Dilivar stud delay the assembly of an engine project? YES Supertec NO
Ever had a Dilivar stud with complete thread engagement in the case? NEVER Supertec: One of the best features is complete thread engagement in the case.
Ever had a leaking head with a Dilivar stud? YES, even though the real purpose of the Dilivar stud was to prevent the cylinder head from seeping on cool down.
Supertec, Well the truth is yes, but not as often.
As a manufacturer I have only fielded one complaint in seven years about my head studs and the problem was actually improperly machined heads.
If Supertec head studs were install on your engine from the factory would you still need an engine overhaul?
The answer to that question for many of you is NO. How many of you have said, "my engine ran great but I have 2,3,4,8 broken head studs.
I rest my case, any questions?
Cheers

I've got a set of these in my 2.6 short stroke wtih 10.3 compression - 2.5 years now and still going strong. They really are worth the money - the nuts were easy to use with my twin plugged app as well.
Regards,
Andrew M

another satisfied Supertec customer here. the studs are art.

I bought a set of Raceware studs, washers and nuts in 1997 for my stock US 81 SC. Heads were shaved 0.006" to clean them up for the new sealing ring. It now cranks out a whopping 9.5:1. No seepage, no issue no nothing. Re-torque of the heads still feels like "butter" (vs the Dilivar) Should I change to Supertec?

I read the long "Would you use these studs" thread and I am exhausted from it. It took me several beers to get through it.

I ain't really going to change the studs given my application but let's assume Raceware had no manufacturing inconsistencies, I am interested in hearing how the Supertec studs are better.

+1

I have just installed Supertec studs in my engine, haven't started her up yet.

Head stud manufacturer is a choice to be made at the beginning of a project. The time for research is before you buy.
If you have already installed your choice, be it Dilivar, Raceware, ARP, Supertec, whatever, use them until you experience a problem.
Buyers remorse before you give your choice a chance seems counter-productive.
Cheers

Hi Henry,

I have 13 years of giving my choice a chance.

I am honestly seeking information about your manufacturing process that differs from Raceware. I am curious only because I am a Porsche enthusiast.

How about I ask this question (again - let's assume you never found any inconsistencies in how the Raceware studs were manufactured) What is the main thing that makes your studs sets better far a race application? The stud length, the alloy? That is all I am after.

All the best.

See post number 8 in this thread and substitute Raceware for Dilivar and answer the questions yourself.
Cheers

Thanks Henry. A pleasure.

I'm adding the Supertec studs to my next PP order!