which headstuds do i have

[shay4g63]

I'm told by the PO that there ar ARP headstuds in the car. Which he did have a arp head stud box and lube in there no paper and couldn't get a number off the box it was so greased.

How can I tell which ones i have?

This is for a 6 point motor

 

[RadDsm]

The studs or nuts will say ARP on them.

 

[shay4g63]

they are instaled so how would i check?

 

[RadDsm]

Pull the valve cover off and you'll be able to see them.

 

[constant_proj21]

Yes they are stamped with arp on the tops of the studs, pulling the valve cover and taking a quick peak should help you figure it out. Also, the ARP part number for 6 bolt head studs is ARP 207-4201.

 

[99gst_racer]

Yup, pull off the valve cover and inspect. If they're studs and nuts of a black oxide finish, then they're the standard 8740 ARP studs.

 

[shay4g63]

Okay, Pulled the cover and BOOM there arps. Now i'm just wondering are these arps any good? Will they hold out to 27psi? or so i go L19?

Also whats the nut size and I've heard/ read people say torque to 90lbs?

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[3kgt2nv]

12 point socket 14 mm

torque to 90 with arp lube.
in 3 steps. 30 - 40 - 90

only way to tell if they are still good is to have measurements when they were still new to compare them to now.

 

[99gst_racer]

Okay, Pulled the cover and BOOM there arps. Now i'm just wondering are these arps any good? Will they hold out to 27psi? or so i go L19?

Also whats the nut size and I've heard/ read people say torque to 90lbs?

As long as you're still running the 20g, you'll have no problems with the standard ARP studs. They should be torqued to 85 ft/lbs using the 3 step process. 30-60-85 ft/lbs with moly lube.

 

[gieri002]

Yup, they will be sufficient for plans. Mine were 13mm, I'm not sure if all arp's are the same size though. Just do a quick search on how to torque these, there is a specific pattern you need to follow and the torque depends on what type of lube you use (moly lube or oil). There are already many different opinions on here so I won't clutter this forum and express my own, but do a little research and you will find what you are looking for.

 

[shay4g63]

As long as you're still running the 20g, you'll have no problems with the standard ARP studs. They should be torqued to 85 ft/lbs using the 3 step process. 30-60-85 ft/lbs with moly lube.

I've just recently dumped the 20g and got a hy35 and i'm looking for 24-28psi running.

Also i'm gonna say that buddy used molylube. And they were put in before I got the car? Can I just try retorquing to 90ft. or should I still do the 30-60-90 pattern?

 

[99gst_racer]

If it were me, I'd loosen them and retorque one at a time. In sequence of course and with moly lube.

 

[constant_proj21]

Yup, they will be sufficient for plans. Mine were 13mm, I'm not sure if all arp's are the same size though. Just do a quick search on how to torque these, there is a specific pattern you need to follow and the torque depends on what type of lube you use (moly lube or oil). There are already many different opinions on here so I won't clutter this forum and express my own, but do a little research and you will find what you are looking for.

Were yours for a 7 bolt? I know 7 bolt headstuds are a mm smaller than 6 bolt studs. That may be why.

 

[turboglenn]

Those ARP's wo;; hold anything up to 30psi or to the limits of about 550 ish (seems past 30psi or MORE so in the airflow numbers that are needed to make 600+hp is whern you need the L19's.)

I've made 30psi daily for 3+ years on my plain ARPS, i ran them at 32psi for one day with no issues and that' s using a normal composite gasket.

I had made a long post about this not to long ago in some one elses threads and more than PSI i think the studs are more limited to the HP goas you have, andything up to 550 i think you'll be just fine as it seems guys making airflow for 600+ are always pushing more than 30psi which is why i think the "30psi rule" came into effect