[jlibert]

building a 6.7 for my new toy and wondering at what point do you opt for the 14mm studs??? and mains too??
will be a pullin truck 2.6 or 2.8 havent decided for sure:confused013:

12mm 625's will provide all the protection you'll need for 2.6-2.8 fuel only power.

 

[82ndsnpr]

you only need 14s if your going to go crazy the 12s will work fine some say the 625s me im not sold on them but if your not making insain power your fine with standard 12mm studs.

 

[Devon E]

Arp 12mm 625s in mine not a problem

 

[cummins04.5handshaker]

Go with H11's they are good from 80-120psi and have longer threads and you'll need to tap the factory threads just a little longer.

 

[dieselwrencher]

I have the cheaper arps in my 06 and had no problems but im not thrilled with spending 1200 on a box of bolts for the 625s:banghead: hope to push four digit power out of this truck some day. and will have h2o on it

 

[fordassassin]

You can get them cheaper at Brown's Diesel.