Engine Rebuild rb26 - arp200 or arp CA625+

[sr20dettttt]

Hi guys,

Just a quick question, my engine is at the shop currently being rebuild.

I know the engine currently has ARP2000 head studs installed (for around 3 years and not driven too hard). 

My engine builder suggested ARP CA625+ head studs. I know they are stronger, however they are also 3x the cost of ARP2000.

Question - Do I need ARP CA625+ ?

I have intentions installing a gtx3582r or 84rs or a g series equivalent turbo later on. It will be a street car. 

Another question - I know the ARP2000 head studs are reusable, however, is it completely safe to 'reuse' them? or would it be safer to just install fresh new head studs? 

Thanks in advance everyone!

 

 

 

 

 

 

[Dose Pipe Sutututu]

How much boost/power you planning on?

Also they are "reusable" but I personally wouldn't. Sell them to someone that's doing a simple build or a refresh on their motor and get new studs.

 

[BK]

As above, custom age is great if you've got money to burn and are aiming for 500rwkw+. I used them on my 32, but meh.

Do you need it, probably not as 2000s will be adequate.

[sr20dettttt]

That's a really good question, I really don't know.

I'm not really aiming for power, more wanting response. Maybe 400 rwkw more or less? Just whatever the engine is happy with, with the set up I described. I love the watching the mines r34 gtr on youtube. If I can get something like that.. or better! That would be awesome! (Hopefully single gtx or g series turbos are better than old twins they had on).

I'm leaning towards arp2000 simply because of cost. 

I am not looking for 500+ rwkw that's for sure.

 

 

[Dose Pipe Sutututu]

ARP2000 done.

I run them with 2bar of boost and head hasn't lifted.

[BK]

As above,you don't need them.

[Murray_Calavera]

A big part of how reusable the ARP studs are is if they have been torqued beyond their yield point. Do you know the specs the head was torqued to before? 

[sr20dettttt]

Nice arp2000 it is then. Thanks guys!

Nope I don't know the specs it was torqued to prior as a mechanic did it for me. But I would assume, since he is a mechanic, they would follow correct torque procedure? 

 

 

 

 

[BK]

You would hope so.

[sr20dettttt]

And because I don't know, I'll probably take on the advice of getting fresh ones and selling them off.

[Murray_Calavera]

4 minutes ago, sr20dettttt said:

Nice arp2000 it is then. Thanks guys!

Nope I don't know the specs it was torqued to prior as a mechanic did it for me. But I would assume, since he is a mechanic, they would follow correct torque procedure? 

 

 

 

 

Well it's not black and white, if you torque it to ARP specs, then they will be below their yield point and the metal will 'spring back' and be reusable again. This is not a guarantee that they are as good as new, but typically they are fine to be used again. 

You can torque ARP studs to yield, it will clamp the head down tighter but now the studs are a one time use only. This isn't wrong, the mechanic may have a valid reason for wanting a higher clamp on the head.

Without knowing how much torque has been put through them, I wouldn't risk using them again. 

[Torque Curve]

Why not go the in between L19 studs?? more than the 2000 but not as much as the CA625.

[r32-25t]

Put the best in there that you can, cause you’ll end up throwing a bigger turbo at it and making more power then your original goal