Hi guys I've a little question about ARP fasteners (Head studs to be exact)

On the APR manual the torque is to be 81 lbs.ft but on the Burton website they talk about 95 !?!
I've heard about 'running-in' the threads to obtain the right torque. I guess the Burton value may be done to avoid the running-in as it's not in the manual included within the box?

Here is an abstract of the ARP technical page..

" The friction factor changes from one application to the next. That is, the friction is at its highest value when the fastener is first tightened. Each additional time the fastener is torqued and loosened, this value gets smaller. Eventually the friction levels out and becomes constant for all following repetitions. Therefore, new fasteners should be tightened and loosened through several cycles before applying final torque. The number of times depends on the lubricant. For all situations where ARP lubricants are used, five cycles are required before final torquing. "

Does anybody have clues about this?
I guess i will do that and also use 88 lbs.ft ...

 

Steve Scott @ A1 recommended a friend of mine to tighten the ARP short studs to 90-95 lbft when using the ARP lube.