Arp head studs, issue with 2.5L SOHC heads. How about ours?

[ciper]

I need everyones help. I read a couple threads on NASIOC that have me worried.

Here are the threads to reference
http://forums.nasioc.com/forums/showthr ... did=462182 which came from
http://forums.nasioc.com/forums/showthr ... did=455036
that was started from
http://forums.nasioc.com/forums/showthr ... did=427668

This thread has the most information http://forums.nasioc.com/forums/showthr ... did=442225

If I understand this correctly the SOCH heads are thicker and use a longer head bolt. The Arp studs are designed for the "thinner" heads so when used on the 2.5 SOHC not enough of the threads are in the block and the stud never bottoms out.

I really wanted to use these in my engine. Can we figure out if this is an issue for EJ22 block/heads?

[THAWA]

What makes ARP head bolts better than stock? I'd have to say stick to stock if you can't find bolts meant for your head. At worse you'll have to change a blown headgasket right? But with the ARP's you could have to get the block rethreded/buy a new one to my understanding.

[ciper]

The ARP studs offer significantly more clamping force when compared to bolts. For example my Supra head bolts where rated for 52ftlbs (if I remember right) and with the arp units I went up to 90ftlbs.

Since the studs are already bottomed out in the engine before installation of the head they dont turn. Meaning when you tighten the nuts the only force applied to the threads is an pulling force and no twisting force. You are not only able to get more clamping but a better reading of the torque applied.

From what I have read it seems the issue of stripping is avoided if you use an allen to tighten them until they are bottomed out. If at this time you install the heads and they are too short you know something is up. I just want to try and make sure before purchasing them and wasting time.

I want my engine to be very burely. If its possible to run 30PSI with the stock HG and bolts then my combo will be ultra durable running less than that.

[Matt Monson]

There have been a couple of group buys that have happened on NASIOC with replacement bolts that do not have this issue. Try hitting the vendor group buys forum or vendor classifieds on NASIOC to get the longer ones.

[ciper]

I hope more people will help, when we work together we can usually solve any problem Read the bottom of this thread (Start on page 4 I think where I ask about it)

http://forums.nasioc.com/forums/showthr ... did=427668

[Matt Monson]

OT commentary: FJP has been whining about this situation for months. He needs to get over it...

Back to the issue at hand...When I get my SOHC heads back from Cobb, I will measure the thickness for you and post back so you can compare to your EJ22 heads. It should be a few more weeks until they are done. If you need this info prior, I would suggest asking if one of the SOHC EJ25 guys on NASIOC can measure their heads and post the specs. But as you say, even the experts can get mixed up, as evidenced by the red washer discussion.
I know there is a guy down in Florida doing an EJ22T with SOHC EJ25 heads build. If I can remember his screen name, I will ask him about it in the next day or two...

[ciper]

Thank you. Ill try to get a measurement of my EJ22T heads since they are already apart from the block.

Where exactly should I measure from and to?

[subiecar]

There are specific stud kits for the 2.5 AND the 2.2 (see my note "I`ve said this before.."). When my correct 2.2 studs arrive, I`ll measure the two and advise the difference if you still need the info. BTW, ARP has over 100 sets in stock for the 2.2; they just need to be packaged for sale. After my fiasco, our engine guru will know the difference!! Good luck.....Rod