Ferocity02

iTrader: (60)

Is anyone overtorquing their ARP head studs for boost? ARP recommends 80 ft-lbs. After a search, 85 ft-lbs seems common and I ever read about someone doing 130 ft-lbs which seems excessively dangerous.

Inspector12

iTrader: (29)

Well they did revise thier original torque specs. I used to do @80 on the standard ARP head studs never did anything more than that. I have seen a shop try 100 on the standard head studs and it snapped. If you want to torque them down to 100ftlbs then buy the ARP 2000 material head studs or the L19's. GL!

Burken01

iTrader: (88)

So regular arp head studs are not the "2000" version?

Ferocity02

iTrader: (60)

There's different versions of ARP head studs??

Adam86

iTrader: (10)

I believe the regulars are 8740s. I've heard 2000s are better but not sure how much better - especially when compared to some higher end studs.

Burken01

iTrader: (88)

I've searched for arp 2000 head studs, there's very little info.

Anyone have part #s?

gnx7

iTrader: (28)

The ARP 2000 head studs are about $200-300 more than the standard ones. More clamping strength and better material.

9sectruck

iTrader: (9)

http://www.summitracing.com/parts/ARP-234-4319/
here are the part number for the arp 2000
these are in my engine now looking to make 1200flywheel on a factory 4 bolt head with these

spinya

I had no idea arp had different versions of their studs good to know. 130ft sounds kinda nuts to me.

dschmittie1

iTrader: (64)

Damn those heads studs are still $450 with my Summit discount. I had no idea either that they had two different head studs

Cam72aro

iTrader: (28)

It gets to the point that more torque only stresses the stud more and does nothing to seal the head gasket.

The Alchemist

iTrader: (19)

That's what my thought was. Doesn't it get to a point that the weakness is the cylinder head thickness and not the strength of the studs?

I torqued mine to 80ft/lbs.

9sectruck

iTrader: (9)

they actually have three versions of these studs, 8740 2000 and the L19, nobody has them listed but I called arp directly and they do have them, I want to say 699 for the set

Reckless

iTrader: (9)

We use 100 max on our 1/2-inch head studs. Anything beyond that and you risk crushing the aluminum on the heads. We usually end up around 90 on the 11mm ARP stuff.

Burken01

iTrader: (88)

Hmm wonder if I should ditch my 8740's for some 2000's on my turbo 346...

Cam72aro

iTrader: (28)

Yes, if you could find a stud that could take a torque of 10000000ftlbs it won't matter, its the head that will fail.

68 SS

iTrader: (23)

I torqued my 1/2 studs to 100ft pounds and I was quite nervous on the last cycle! No way would I try torquing the standard studs to 100 ft pounds 80 would be the max IMO.

9sectruck

iTrader: (9)

anybody have a part number?price for the 1/2 head studs?

Reckless

iTrader: (9)

Here's a hint, they are not offered by ARP

Burken01

iTrader: (88)

So if I was going to run 317 heads on a ls1 block and plan to run boost up to 17-18 psi, you think my 8740 arp head studs will suffice?

I don't want to lift heads..

Opinions?