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Join Date: Jan 2005
Location: Western Canada
Posts: 2,058
Headstuds for 2.7 magnesium case

Hello

Iíve done a fair amount of reading in this topic but still come up
Confused.

Are the preferred cylinder head stud for a magnesium case 2.7
steel head studs.

So I was considering 993 steel studs but also see 993tt studs which
I think are dilivar studs.

I know thereís lots of options, just looking for a set up that works
And not fancy.

Case has case savers installed.

If your running steel head studs on your 2.7 please share. How are things holding up.
Old 06-27-2018, 12:14 PM
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The steel head studs are fine, but have case savers installed. I wouldn't bother with 993 studs.
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Old 06-27-2018, 12:19 PM
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Join Date: Dec 2008
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Reading up on what 'chris_seven' stated, I'd use Dilavar for mag cases.

He wrote a very detailed analysis on studs and how they react during heat cycling under my stud thread. Very insightful.

I have an aluminum case, so I would use the ARP or Supertech ones, which do not expand at the same rate as aluminum, but seems not to be an issue with the stud bosses of the case (thread pullout).

For now, I have 993TT studs, and Henry Wiener states these are great all around for every case (if I am not misconstruing his words). Only reason I considered ARP or Supertech is because I am boosted and needs a lot more clamping force.
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Cory - turbo'd '87 C3.2 Guards/Blk, 3.4, 7.5:1 CR P & C's, soon to be 993SS cams and GSXR 750 ITB's fed by 964 intake, Borg-Warner S366 turbo @ 1.4 bar, Treadstone full bay IC, TiAL F46 WG, HKS 1 1/2" BOV, twin 044 pumps, MegaSquirt 2 (v3.57 board) w/EDIS, Tramont wheels (285's rr, 225's frt), Big Reds frt, 993 rr., tower brace, MOMO wheel

Last edited by Tippy; 06-27-2018 at 12:57 PM..
Old 06-27-2018, 12:55 PM
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Join Date: Jan 2005
Location: Western Canada
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Thank you for the replies. I’m honestly leaning towards steel studs.

I know I read about the expansion rate of the steel vs dilivar studs and dilivar being a better match
For magnesium and aluminum.

Just my experience with a 2.2 and 2.4, both being simple steel cylinder head studs and they were just fine. I’m going to keep things simple and see if I run into any problems.

A main priority is keeping the 2.7 as cool as possible, multiple oil cooler if needed. I’ll see if that helps .

I don’t know, maybe I’m wrong
Old 06-27-2018, 03:22 PM
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Location: Nash County, NC.
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It really has to do with the expansion of the aluminum 2.7 cylinders that steel couldn’t control causing the pulling of the magnesium of the case.
Bruce
Old 06-27-2018, 06:08 PM
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