:usflag Has anyone tried the off brand head studs on ebay ?
Ed,Weld if you don't mind me asking what amount of torque did you start with when installing your studs.
I have my engine down for EGR cooler and oil cooler so I am going to pull injectors to check Orings, so I may as well install studs now.
I unbolted it so I could move it around but didn't disconnect and lose the charge in the A/C. I then used a hole saw or spade bit and cut a hole in the plastic housing. Made it possible to remove the bolt and insert the stud. I then used some aluminum plate I had and made a plug with two pieces and clamped them together with a screw and nut (inside and outside housing) Dabbed it with silicon to seal it up and glued the heat shield back on.Weld engineer what did you have to do with the heater housing on right side to get the head bolts out?
Nice catch. I just looked at arp website the custom aged 625 list at $1600. Ouch. I guess if your building some serious HP and high boost.254-4204 is the ARP 2000 material. Retail is about $470 these days.
254-4205 is the ARP Custom Age 625+ material. Retail on these is a whopping $1100+
Custom Age 625+ is a higher yield material than ARP 2000, the yield point being the amount of stretch you can apply to the fastener before it loses it's ability to pull back, also meaning more initial torque and greater clamp load from the stud in the same application. That's the difference.