jbiel

I am getting ready to preform a head gasket and arp head stud installation on my newly acquired SC300 5spd and I am having trouble finding the exact ARP part number.

Their catalog lists Toyota 2JZA80 - 203-4205 for the uncut studs. I see no mention of the 2JZGE or 2JZGTE motor, only the 2JZA80. Not it is my understanding that 2JZA80 is just the chassis code.

Are the head studs the same from the 2JZGE to 2JZGTE motors?

aliga

iTrader: (147)

yes, they are the same

jbiel

Thank you for the quick response.

Now on to ordering.

jbiel

ARP has two different listings.

12 point nuts - 203-4205
12 point nuts U/Cut Studs - 203-4702

What is the difference?
Which is the best to run?

codetoad

iTrader: (2)

Jbiel, don't you post on RacingPensacola?

btw grats on the SC300. What are your plans with the car?

-Cody

Lextreme

I just tried to install a set of ARP head studs into my GE motor and it doesnt fit. The head doesnt allow the nut to go in and the holes from the GE head is too small for any type of socket.

Belement

Some what an old thread but glad u said something im about to start getting stuff together for my turbo and was gonna get teh ARP studs

5sp_jzz30

iTrader: (2)

undercut studs are made so they dont preload on initial engine break in. when it is a regular stud it will expand in the head and maybe not seat properly. This unstresses the threads, removing them as the weak-point of
the stud. It's a much better design. an undercut stud is a little smaller in diameter where it goes through the aluminum head. it is wider at both ends where threads are.

Lextreme

I am not follow you. I have a newly rebuild head with 2mm Cometic gasket and ARP studs. I installed the studs and MLS today, but the head was designed for Allen style bolts not nuts type. Therefore, 13 mm 12 corners socket wouldnt able to read the nut due to interference of the head. I will try again tonight and see or perhaps a special tool. Otherwise I might have to machine the head (stud holes) in order to tighten the studs.

5sp_jzz30

iTrader: (2)

all i mentioned were advantages of undercut studs over regular stud. i dont understand how it doesnt work. pretty much all cars out there use a bolt to hols down the head and not a stud. the head on most ARP head studs is smaller then the factory bolts. i never did a 2jz. ive done arp studs on pretty much every VW/Audi engine out there, 4AGE's, SR20's, 7MGTE's. never had issues. good luck. post some pics of the problem you're having.

trangk

I had this same problem installing my ARP studs on the -GTE motor. Instead of the 13mm 12pt, I used a 1/2" SAE deep socket and it worked perfectly ... try that.

Lextreme

That sounds a lot better. I will try that. 1/2" is very close to 13 mm.

Update: 1/2" deep socket will do the trick. 13 mm wont work. Thanks guy!

FormosaSC

so which one should we buy? im looking to buy apr studs too, are the ones people are selling for supra tt ok?

Lextreme

Like Trangk stated, you need 1/2" 12 points deep socket instead 13mm 12 points. The out side diamter is small on the 1/2" then 13 mm. The studs are the same for either engine.

SCoupe

Supra TT are exactly what you order for the 2jzgte. My engine was a JDM that was brought up to usdm specs and the ARP studs went in just fine. This is a great upgrade for the engine for all the reasons said by 5sp jzz-30.