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Pro-Comp Head Studs sold on Ebay

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Old Oct 28, 2012 | 07:58 AM
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I sent a message to an eBay seller of the ProComp studs & here is the reply:

Thank you for your inquiry on our Pro Comp LS head studs. To answer your question, if you are unsure on what to torque these to, I would suggest contacting Pro Comp direct, and speaking with a tech. They can be reached at (909)605-1123. If you have anymore questions, feel free to message me back or contact us at (515)-733-2890.

Thanks for shopping with KMJ Performance!
-Mike
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Old Oct 28, 2012 | 12:38 PM
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I'm wondering if I should try thoses eBay studs or use the stock replacements
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Old Oct 29, 2012 | 12:06 PM
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Originally Posted by chevybayboy
I'm wondering if I should try thoses eBay studs or use the stock replacements
I was somewhat considering them until I saw the recommended torque specs.
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Old Oct 29, 2012 | 12:36 PM
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Originally Posted by hiltsy855
I was somewhat considering them until I saw the recommended torque specs.
I know don't seem like much... But I spoke with brain at Tsp and he said the 98-03 arp head bolts were 178.00 I'm gonna hold on my build and just get thoses
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Old Dec 27, 2012 | 12:15 PM
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Well I went ahead with the ProComp studs. I was quite pleased with the quality & finish of the kit. I installed finger-tight & torqued them to 25-50-75 ft.-lbs. on the 11mm (7/16") studs and then 18-23 ft.-lbs. on the 8mm (5/16") studs using ARP assembly lube & GM MLS gaskets. The only 'issue' I had is that the end of the 8mm studs do not have a hex to aid installation (not sure if ARP's have this or not). I didn't realize that until after I torqued the 11mm studs, otherwise I would have screwed the the 8mm studs in before putting the head on the block. So I locked two 5/16-24NF jam nuts together on the stud and used them to screw it in. Overall I was happy with the installation.
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Old Dec 27, 2012 | 01:46 PM
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What are the procomp torque specs?

what is listed above jives with ARP specs.

I don't recall if ARP 8mm studs had Allen key or not. I will look
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Old Dec 27, 2012 | 04:00 PM
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I didnt get any paperwork with specs on mine
I did 28# on the small studs and 90# on the big studs, need as much clamp as I can get
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Old Dec 27, 2012 | 05:08 PM
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Ya, there weren't any specs., paperwork, nothing in the box LOL. I torqued to 75 on the 11mm studs, basically using the average of the old & new ARP specs.
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Old Dec 27, 2012 | 05:13 PM
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Yes, all ARP studs are allen keyed. I did mine a few months back.

GLAD to hear they went good!
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Old Dec 27, 2012 | 05:19 PM
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Originally Posted by dr_whigham
Yes, all ARP studs are allen keyed. I did mine a few months back.

GLAD to hear they went good!
Thanks for the info!

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Old Dec 27, 2012 | 05:24 PM
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If I remember correctly...Torque specs are 75% of the yield strength. I wouldnt even dare to torque NON ARP studs more than ARPs specs....90ftlbs and 28ftlbs is alot!
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Old Dec 27, 2012 | 08:33 PM
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Originally Posted by hiltsy855
Well I went ahead with the ProComp studs. I was quite pleased with the quality & finish of the kit. I installed finger-tight & torqued them to 25-50-75 ft.-lbs. on the 11mm (7/16") studs and then 18-23 ft.-lbs. on the 8mm (5/16") studs using ARP assembly lube & GM MLS gaskets. The only 'issue' I had is that the end of the 8mm studs do not have a hex to aid installation (not sure if ARP's have this or not). I didn't realize that until after I torqued the 11mm studs, otherwise I would have screwed the the 8mm studs in before putting the head on the block. So I locked two 5/16-24NF jam nuts together on the stud and used them to screw it in. Overall I was happy with the installation.
Got a pic of the outer studs? I have a set of these (not in use yet) and when I test-fit them, it seemed there was about 3/4" sticking up past the nut. This was with the (old) head gaskets in place, too.
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Old Dec 27, 2012 | 10:36 PM
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Here are a couple pics. On the 11mm studs I measured about 3/8" above the nut. On the small studs the nut is almost flush.

Name: DSCN7408.jpg Views: 249 Size: 231.6 KB

Name: DSCN7409.jpg Views: 305 Size: 254.1 KB
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Old Dec 27, 2012 | 10:39 PM
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Originally Posted by badazz81z28
If I remember correctly...Torque specs are 75% of the yield strength. I wouldnt even dare to torque NON ARP studs more than ARPs specs....90ftlbs and 28ftlbs is alot!
I agree. My 1st thought was to go with 70 ft.-lbs. (the original ARP spec.) and I had to convince myself to go to 75 ft.-lbs. I'm glad I did now since they torqued up just fine.
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Old Dec 27, 2012 | 10:46 PM
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Yeah mine stick up a LONG way, but my heads are milled a ton and thin gaskets

They took 90# just fine. Didnt have any ARP lube left so I should mention that was with 30wt oil.

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Old Dec 27, 2012 | 11:19 PM
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Looks familiar...here's mine. They are ARP
Attached Thumbnails Pro-Comp Head Studs sold on Ebay-prcw.jpg  
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Old Dec 28, 2012 | 07:37 PM
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Originally Posted by Grr
Yeah mine stick up a LONG way, but my heads are milled a ton and thin gaskets

They took 90# just fine. Didnt have any ARP lube left so I should mention that was with 30wt oil.
My mock-up looked like yours and my heads were milled to 59cc. I think that mill is still only 0.050" or so. Less than 1/16" of an inch shouldn't account for that much extra length?

I don't know the numbers for sure, but torque numbers with ARP lube are always lower than plain oil.
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Old Dec 28, 2012 | 08:28 PM
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Im running a .040 gasket and my heads are milled into the 40's, over .100". So Ive got a 1/8"+ extra sticking out
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Old Dec 28, 2012 | 09:28 PM
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I used the Pro Comp head studs in my new engine. No issues at all. Can't beat the price.
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Old Dec 28, 2012 | 10:35 PM
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Originally Posted by ThumpnZ28
I used the Pro Comp head studs in my new engine. No issues at all. Can't beat the price.
Good to hear. What did you torque them to?
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