For those of you with ARP head studs.....

[mbmbmb23]

...read the link here, paying attention to the part about "undercut studs" and let me know your thoughts.

http://www.alamomotorsports.com/arp/hsnissan.html

Seems like the non undercut CA studs are just the rebadged SR peices.

-m

[davidricardo86]

...read the link here, paying attention to the part about "undercut studs" and let me know your thoughts.

http://www.alamomotorsports.com/arp/hsnissan.html

Seems like the non undercut CA studs are just the rebadged SR peices.

-m

When i was in the process of ordering my studs, i called ARP directly and asked them what the differences between the regular and undercut studs were. Basically what i got from the was that the regular studs are a bit stronger, not necessarily because of material type but the fact the the undercut ones have less material or metal around the smooth parts of the shank(im not talking about the threads).

Im assuming thats how they'll more or less stretch a little more if theres less material in that area. They also told me that the regular studs are better for situations like drag racing. The undercut ones are better for "street" stop-and-go type situations. Yeah, i dont know what the sales rep meant by that but i asked atleast three reps and they all agreed to go with the regular studs. I think you can get a little more infomartion than is provided by that link directly from ARP if you download their catalog.

It seems that years ago there were some problems with the studs and threads. Apparently there were different threads and pitches that the CA block came with that people were getting the wrong studs. It turns out that ARP has since corrected the problem and now you can get the correct kit using the new corresponding part number they put out. I think you dont have to worry about this problem anymore.

Here is what i bought and have installed in my motor, it works too! It was the "original" stud kit for our CAs before it got its own part number.

ARP SR20 Main Stud Kit 202-5402 (head stud kit) - $82.84

[float_6969]

The big problem was something about a different thread pitch on the UKDM motors or something weird.

[AFSil80]

So the UK CA18's DO have a different head stud thread pitch?

I wasn't sure what all was different between the UK and J-spec motors, aside from the head/intake design.

[davidricardo86]

So the UK CA18's DO have a different head stud thread pitch?

I wasn't sure what all was different between the UK and J-spec motors, aside from the head/intake design.

Apparently they did! Just another difference between the two versions. Pretty cool none the less!

[AFSil80]

Apparently they did! Just another difference between the two versions. Pretty cool none the less!

Damn, I hope that doesn't cost me more. Knowing my luck it will...

[float_6969]

The big problem was something about a different thread pitch on the UKDM motors or something weird.

Don't quote me on that guys, but I'm about 70% sure that I remember something about the thread being different on the EDM CA's.