[Mr-Moo]

Soo, I started putting in my head and I got the bolt to 90 ft/lbs of torque and it popped real loud. I originally thought it broke off inside (almost cried), but it backed out just fine. Take a look at the pictures below and lemme know wtf happened. These bolts are new. Do you guys think my threads in the head are bad? I don't have a tap for the head bolts.

Thanks!

Sent from my Droid using Tapatalk

 

[shanover]

You had a soft spot in the bolt threads, you can see how they stretched, it happens sometimes. The bolt didnt get properly tempered for the full length of the shaft. You were lucky it backed out, the times it has happened to me, I had to remove the head and use a punch to try to get the broken part of the bolt backed out enuff to grip it with vice grips or pliers or something to get it out. Sometimes you have to drill the bolt and use an easyout on it.

 

[CORN DOG]

What Bolts are those?

Use ARP Bolts

 

[Mr-Moo]

Not ARP, but ima swap em out for them. I figured advanced auto would have some quality, guess not. Learned the hard way

Yayy, another waiting game for new bolts. I miss my spec

Sent from my Droid using Tapatalk

 

[Mr-Moo]

Ok, so I can't find anyone with ARP head bolts... Does anyone have ARP head studs? Who here knows some good head bolts and a resource to purchase them at? I've been searching the interwebz but I haven't found anyone who sells ARP studs/bolts for our 2.5l car.

Advice is appreciated, thanks

 

[Scrapin]

you have to get arp bolts for a ford cosworth iirc

 

[CORN DOG]

Here you go buddy

AUTOMOTIVE RACING PRODUCTS, INC. - ARP Hardware - QR25 - Race Engineering, Inc

 

[Mr-Moo]

Thanks Corndog,

I posted in another thread as well, you don't happen to know if the torque specs are 90lbs or 110lbs? Also, this is the same item, correct?

ARP 251-4701 - ARP Pro Series Cylinder Head Stud Kits - Overview - SummitRacing.com

These are cheaper at Summit, and they rock with their customer support

 

[Scrapin]

corn dog ftw!

 

[CORN DOG]

I dont know if they are the same or not? They dont "officially" make them for the QR25 but Race engineering put together a kit for us. as far as TQ specs, Intense power built my engine so i dont know.

 

[Scrapin]

get the ones that say qr25. when i was going to build a qr25 the bolts i had were for a cosworth and they fit. but since they makes ones for the qr get those ones.

 

[Mr-Moo]

Ill call them up Monday, talk to their customer service. Thanks for the advice guys. If anyone knws the torque specs id greatly appreciate it.

Sent from my Droid using Tapatalk

 

[darkstarxi]

If you search for part# HBD42 on Import Performance Parts - Import Performance Engine & Racing Parts, they have a set of Pro Topline head bolts for the QR25 for $75.

 

[ash]

http://www.b15u.com/engine-swaps-builds/18362-arp-main-stud-kit-head-stud-kit-part-s.html

 

[Mr-Moo]

I appreciate all your guys help. When the parts come in I guess I'll be torquing down to 90ft/lbs. IF anyone can advise me otherwise I'd appreciate it.

Thanks for all the links and information!

BTW - Ash, thanks for your head tutorial, its been helping me a lot.

 

[Mr-Moo]

I put the studs in. Tightened studs to 20 ft/lbs torque so everything was even (after chasing it with a tap and blowing the head bolt holes out). Tightened nuts down to 90ft/lbs.

Should all be gooooooooood, never again will I have to buy head bolts

 

[CORN DOG]

so where did you end up buying from and how much$$

 

[Mr-Moo]

Got them from Jegs auto parts. Didn't want to take a risk with a small-time vendor and not receiving my product. Spent 140$, came in 2 days.

 

[frozenbarb]

Did yu use arp?if you did, did you have to tap the block?

 

[slyguy700]

did you read instructions on what to torque the studs to?