Inspector12

iTrader: (29)

The 625 studs I had someone mention at a meet a while back, but since studs are reusable etc... I never checked into them etc...I am running the L19's on my TT ZO6 and have used them in the past on a couple of motors and the strength was equal to a 1/2" stud as far as the PSI that you tourqe them down to @100lbs. And when I mention the ARP2000 head studs, they are made from the ARP 2000 material and not the 8740 , same with the L19's. The ARP 2000 head studs were just slightly less strength wise, but been torquing those down to @90lbs. Those CA625's look like they are very promising and I would probably call ARP and check on them etc... GL!

stevieturbo

I just have the regular ARP's and torqued them to a little under 80lbft.

In terms of strength, would this be fair ?

ARP
ARP2000
L19
CA625

other ?

Inspector12

iTrader: (29)

That seems right from what I'm reading.

helga203

Where would the ebay cheapies be( KMJ's) on that list?????????

wilson34

iTrader: (7)

You can run LS9 gaskets on 1/2" head studs and they will fit without much grief. That's what I did.

Inspector12

iTrader: (29)

They must have changed them then since I tried as they didnt fit that back in 2011. Ended up with Cometic's at the time.

atomic 6

Don't think they have ever changed the LS9 from the 12mm head bolts they all have stock.

More likely someone sent you the wrong gaskets,and called them LS9 gaskets.

The bolt holes in an ls9 gasket have to be 12mm or larger to accomadate the factory 12mm head bolts.

Inspector12

iTrader: (29)

No I don't think so. I was assyembling it at HKE and Erik had a lot of different gaskets, but pretty confident about them. But hey if they fit for you guys then it doesn't matter what happened to me really. I was just trying to help is all. GL!

BigRich954RR

iTrader: (1)

I tell the other person over tq of head studs should not warp a head as long as the fastner is able to handle ther over tq and not get weaker.

The arp 625 plus I know sometime they get tq to 180-190 ft lbs on diesel trucks they are spec to tq to 150 and are i think a 1/2 stud. over all a very strong stud the threads in the block will be the weak link here i think.

jalper

iTrader: (9)

The ones I used from Alper Motorsports, I went to 60lbs using ARP lube and on the small studs I went to 23lbs

I have used the Alper Motorsports Studs on about 10 Motors With No issues, I over tightend one stud, and the Aluminum pulled out before any stud issue

stevieturbo

60lb ? That's really low

67Firebird455

iTrader: (27)

Thought the same thing, I thought they were 80lbs+.

stevieturbo

Normally yes. I guess if it's just a n/a build or not making a lot of power, 60lbft might hold ok.

But generally ARP's are 75-80lbft on these engines.

01snake

Tqd my kmjs the big ones too ~82lbs and the little ones to 30 or 35 using motor oil on threads

Grr

iTrader: (2)

I have used the ebay studs multiple times normally 80#/20# with oil this time 90/28. Never had any complaints they are awesome for $80

a-low

iTrader: (26)

I just got kmjs and cant fit the allen keys on at least half of them the other half is fine
now im a little worried if theyll hold lol.

67Firebird455

iTrader: (27)

LOL, run it...

stevieturbo

Even ARP studs have a tight fit.

Although why the hell the make a metric stud with imperial allen key fitment is very annoying.

jalper

iTrader: (9)

Just Curious, Why the KMJ's over the Alper Motorsports head studs

djfury05

iTrader: (30)

Interesting thread.. good read.. will the ARP2000 pro series head stud kit fit Gen lll blocks such as the LS1 block? Curious between the differences of up to 03 blocks and 04 and up..