rcatherton

I have an S2 bottom end and need a 2.7 head for the 3.0 turbo build. I can get a new bare head from the dealer but I am not sure how bare the head would be. Does anyone know if it would include guides and seats. If anyone knows were I can locate a good 2.7 head it would be appreciated. With regard to the head studs are the raceware or arp studs required. Does arp make a stud for this application? I do not remember if the threads on the stock studs are wider then the stud below like a 911. Would it be possible to extend the threads and shorten the existing head studs on the S2 block?

Chris White

Nope - you need to pull the S2 studs and install 2.5 studs.

Typically a bare head has nothing - its pretty expensive to add all the valves and springs - the 2.7 intake valve is not cheap!!!

and finally - sorry just sold the last 2.7 head I have a couplke of weeks ago.

fast951

As Chris already stated, you need new studs. I have a few 2.7L heads, I might be willing to sell one. The 2.7L heads are hard to find and are getting harder, so the price will reflect the rarity!

Tom M'Guinn

From what I can tell, not all 3 liter blocks have threads of the same depth. Once you get your head and block, its safest to measure for the length of studs you need. On my 89 block, with a 2.7 head, I need studs that are about an inch shorter than normal 951 studs.

Duke

Yeah there are special Raceware studs available for those blocks. Very expensive though..

rcatherton

I did not find the length of the studs in PET or the workshop manual. If I remember correctly there was a reference to the installed height however for the 2v and 16v. Tom, so based on your post it appears the studs in the 3.0 liter block engage at a depth an inch shallower then the 2.5 block. I also assume the 2.5 and 2.7 heads have the same installed height. Does anyone have the specs on the raceware studs?

Tom M'Guinn

A 951 head stud is about 192mm overall, and in a 951 block with a 951 head, it should be installed so that it is about 72mm above the deck. In most (all?) 951's, the threads go deeper than needed (meaning the holes are over 120mm deep).

On my 89 2.7 block, the thread holes are only 90mm deep (approx 30-35 shallower than a 951). The installed height for the 2.7 head is a little shorter, maybe 70mm, for an overall stud length of about 160mm, which is about the length of a 968 stud.

It really is safest to mock up the motor and measure (including your gasket thickness) rather than going by what it "should" be...

rcatherton

Tom,

Great info. So if I understand you correctly the 968 studs could work on the 2.7 block and head. Do you know what the thread depth is on the S2 and 968 blocks?

Thank You

Tom M'Guinn

In my case, yes, the 968 studs work. I once measured the 968 thread depth, but can't seem to find my notes and no longer have that block. Maybe someone else can measure.

Pauerman

My 968 block and studs do not work with my 2.7 head - they're too long. I was hoping that the 2.7L studs were going to work. I'll have to do some measuring and will get back with the 968 stud depth.

Tom, do you know the 2.7L stud length?

sandvik951

this guy in Norway have some cool cars : www.944968.com

lleroyb

I have to remember that site the next time someone asks "can I turbo my NA".

Lou

Tom M'Guinn

I don't have a set of factory 2.7 studs, but based on the 2.7 block and the 2.7 head, they must be around 150mm. When I ordered studs of this length from Raceware, they sent me a pre-packaged set of studs labeled as 968 studs. I'd be very curious to get the measurements from your 968 block -- thread depth, overall stud length, as well as the height of your head from deck to washer landing.

EDIT for prosperity: the studs for an 89 2.7 block and head are 150mm long (not 160mm).

Pauerman

Thread depth in the 968 block is just over 88mm on the average and according to my trusty tape measure, the stud length is approx. 167mm - don't have a caliper that big, sorry.

I have measured the deck to washer landing for the 2.7 and 951 head. I can't seem to find those notes right now, but if memory serves me, I think the dimensions were fairly close. My 951 head has been resurfaced almost to the point of eliminating the witness mark on the deck face and my 2.7 head hasn't been touched. This didn't seem to make that much of a difference.

Olli Snellman

S2 has few mm's wider timining belt. Which timing belt are you using with 3,0 liter applications equipped 8V head ?

i have tried to locate Mahle 104mm turbo pistons, but this seems to be a mission impossible. Lindsey Racing told me they have a special coated JE pistons which will work with Alusil block. Do any of you have experience with these pistons ?