hiltsy855

iTrader: (35)

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

chevybayboy

iTrader: (6)

I'm wondering if I should try thoses eBay studs or use the stock replacements

hiltsy855

iTrader: (35)

I was somewhat considering them until I saw the recommended torque specs.

chevybayboy

iTrader: (6)

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

hiltsy855

iTrader: (35)

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.

badazz81z28

iTrader: (6)

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

Grr

iTrader: (2)

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

hiltsy855

iTrader: (35)

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.

dr_whigham

iTrader: (49)

Yes, all ARP studs are allen keyed. I did mine a few months back.

GLAD to hear they went good!

hiltsy855

iTrader: (35)

Thanks for the info!

badazz81z28

iTrader: (6)

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!

S10xGN

iTrader: (11)

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.

hiltsy855

iTrader: (35)

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.

hiltsy855

iTrader: (35)

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.

Grr

iTrader: (2)

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.

badazz81z28

iTrader: (6)

Looks familiar...here's mine. They are ARP

S10xGN

iTrader: (11)

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.

Grr

iTrader: (2)

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

ThumpnZ28

iTrader: (23)

I used the Pro Comp head studs in my new engine. No issues at all. Can't beat the price.

hiltsy855

iTrader: (35)

Good to hear. What did you torque them to?