Recommendations would be greatful thanks in advance.

 

cometic gaskets and 12mm studs. what else do you need to know?

 

Thank you. Which brand of studs.

I had my eye on the EVOMS Hellfire gaskets and 10mm studs. But looking for alternatives.

 

call sean at srm. cometics and 12mm evoms studs or he also has arp 12mm studs

 

Im using EVOMS head gaskets, 12mm studs from SRM.


So far so good.

 

I believe that the 12mm stud needs a "drill and tap" procedure. I think SRM may have made an alignment device to aid on this.

I guess the real question is, does the 10 mm stud truly need re-torquing after their first heat cycle and/ or does the 12mm solve it? Also, what pressure levels will the 10mm withstand and has anyone experienced failure with this diameter?

Thinking "outside the box" here? Is it the diameter of the stud, or is it the actual material used to create it the limiting factor regards to heat strength. Their are different grades of alloys and heat treatment cycles that can enhance the stud strength.

I couldn't find much on Cometic Gasket for Porsche. Krazy, do you have link?

In the end to my post, I know where your heading Nick, and I look forward to it!

 

SRM, You recommend the Cosmetic (still unknown) and,

http://www.evoms.com/High_Performanc...p/evhsk-10.htm

or

http://www.evoms.com/Porsche_Turbo_H...enghg996tt.htm

 

Thanks guys I am not going to rush into this as there's lots of debates around the gaskets and studs and torque settings.. Thanks for the input!!!

 

I don't disagree with you. But I do like to do my research and I do like to know why certain parts are chosen etc etc. I don't like to just be told use this part it's the best end of. I like to know why is it used instead of xyz etc etc

 

yeah I remember Cometic from my Honda days....15yrs ago

 

ill chime in here. i contacted racewear directly and never did they ever recommend 85 ft/lbs on their 10mm studs. in fact they will only recommend a second retorque as part of their procedure. 60 ft/lbs max. this was only after numerous studs let go at the original 45 ft/lbs they used to want the studs torqued to. i have layinbacks motor with 10mm racewear studs and BOTH sides were lifted after less than 10k miles and 800 rwhp. he chose not to do a retorque. as for head gaskets strock is fine. i went 3.8 and chose the cometics based on evoms history with them and 12mm studs. at 90 ft/lbs theres no retorque needed so the cost is offset by not having to pull the motor twice and replace gaskets for the retorque.

tim941nyc only uses 10mm . how he does what he does is a secret he chooses not to divulge. that being said theres enough 10mm studs lifting to make someone think twice before using them
as for darrins build no matter how many times the motor was pulled not a single time was it for a stud lifting or pulling the cylinder threads. in fact evoms lays claim that they havent lost a single motor due to the studs lifting since they went to 12mm.

ask your engine builder if this method is so great why are they letting the heads sit overnight? due to settling? then why overtorque and not use the stud manufacture spec'd torque? because they loosen up thats why. your builder is way overtorquing the studs in hopes that when they back out they will still be within spec

 

This is good info thanks 32Krazy.

 

the thing to look at is quality of the products and how the engine builder is using the product. call john bray at evoms. dont think many on here will put doubt in his ability as an engine builder. call racewear and ask them what they want for a proper install. call todd at protomotive. ask him.one of the best engine builders in the country if not the world. in the end you have to put your faith in the person you choose to build the motor. i saw firsthand what happens when the heads lift. imo i didnt want to risk that agin after spending 20k$ on building the motor. looking at yumerivicks build vr6tee blackhorseturbo and others and the materials sean used in his motor darrins motor and a host of other motors he has built led me to choose the products he recommended. i had 10mm sitting on the shelf. i chose to wait close to 3 months for a set of 12mm studs from evoms because i felt the cost benefits and the simple size difference was worth it. made sense to me that increased thread count and circumference of the stud would handle anything i threw at it.look at supra motors. capable of 2000+ hp and they run 12mm. regardless of who makes the stud if the thread count is a fixed amount and the bolt is built to stretch then overtorqueing it by almost double the initial specs isnt a reasonable answer to fixing a problem.

 

I just installed mine. I got:
12mm ARP with holes drilled @ SRM perfectly on the CNC machine
SRM Cometic HG
Head resurfaced
Used angle torque method for install that I created

 

Here is my install:
https://www.6speedonline.com/forums/...-thread-6.html

Def check out the bit I wrote on angle torqing. For the stock studs the manual calls for 20 ft lb torque plus 90 degrees, so there is presidence for it.