Poodles said:
yes, but ARP also says that their specs are used as a guide, not over the stock setting...
I did 85... but I have studs...
Really? And where does it say that it ok to torque to whatever you want?
You're either pulling that comment out of your arse, or you need to work on reading comprehension. The spec sheet is very specific:
Torque values are based on 75% of the fasteners yield strength. Use the manufacturers torque sequence, but do not use the engine manufacturer torque specs.
Very specific torque values follow this statement...if the box says the values are "a guide", the meaning is the value on ARP spec sheets are
THE GUIDE to be used for installation.
Also, per ARP's tech section:
It is important to note that in order for a fastener to function properly it must be “stretched” a specific amount. The material’s ability to “rebound” like a spring is what provides the clamping force. You should know that different materials react differently to these conditions, and ARP engineers have designed each fastener to operate within specific ranges.
On the other hand, if a fastener is over torqued and becomes stretched too much – you have exceeded the yield strength and it’s ruined. If the fastener is longer than manufactured – even if it is only .001,˝ it is in a partially failed condition. Therefore, ARP has engineered its fasteners with the ductility to stretch a given amount and rebound for proper clamping.
Heat, primarily in aluminum, is another problem area. Because the thermal expansion rate of aluminum is far greater than that of steel it is possible to stretch a fastener beyond yield as the aluminum expands under heat. An effective way of counteracting material expansion is through producing a more flexible bolt.
Not over torquing a head bolt/stud is even more important on an aluminum head like the 7M. The greater thermal expansion of aluminum puts more stress on the fastener as is...that is why ARP limits torque on 7M head bolts to 75 ft/lbs.
I'm not trying to start a flame war with you, but guys on this forum really need to stop "selectively interpreting" specifications like this based on what they have done as a result of "my buddy told me". You over torqued your studs plain and simple...not by much...85 ft/lbs is likely not a big deal. But it's still wrong and the next guy may think going to 90 ft/lbs is ok (a little extra for "insurance") and post what he did. Then the next guy goes to 95 ft/lbs for the same reason...next thing you know the misinformation has caused the bolt to fail for someone because they read this forum and not the sheet.
Post the correct info, or don't post at all.
