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Author Topic:   Fastner life span
dirtracer7
Member
posted December 15, 2003 06:29 AM
what is the normal life span of arp head studs,and bolts,main studs or bolts and arp 7/16 rod bolts.Been running them 3 years and wondering when they should be replaced.Don't have a stretch guage.


zeroracing
Member
posted December 15, 2003 10:52 AM
been using arp head & main studs for years and never had a problem. arp make fasteners for a living, i don't think they would put them on the market if they're junk.
i would go studs over bolts any day. as for their life span, i don't know, might be best to email their tech support on that.


zeroracing
Member
posted December 15, 2003 01:12 PM
That's odd that they're stretching an ARP stud. If a stud stretches, a bolt made of the same material doesn't have a chance. The bolt is weakened slightly when it's torqued down since it's being twisted and stretched at the same time. A stud is already in place, so it's just being stretched.

Although, if they replace 'standard' studs from XYZ company (not ARP) with ARP bolts, it's probably more of a weakness in the other company's studs. Not that the bolts were better, just that ARP makes better stuff. Especially the pro series bolts.

Factory bolts should all be pitched and replaced with new pieces. I prefer ARP and I think if you ask around, you'll find the vast majority of engine builders & racers use ARP. Everything in my motors from oil pan to valve covers is ARP. They're Black Oxide SBC acces. kit )oilpan, VC, TC, intake, motor mounts, WP etc) is like $65 from Summit.

Cheap insurance if you ask me. It really ***** to have a WP, VC or intake bolt break at the worst possible time. 'cause you know it'll be at the track, on the biggest race of the year, 30 minutes for racetime.

[This message has been edited by Raz_900 (edited December 18, 2003).]

[This message has been edited by Raz_900 (edited December 18, 2003).]

dirtracer7
Member
posted January 02, 2004 06:38 AM
I called arp to see what they recomennd.bolts and studs if they can be torqued and hold it there good.rod bolts need to be replaced when they are .001 longer than they started free length.so you are suposed to check and record the length when ther new and keep track of it and s**** them when there .001 longer.


goinrcn44h
Member
posted January 02, 2004 02:32 PM
I use ARP studs for the heads in my 360 sprint engine, I run no less than 13.5:1 to 14.5:1 , and have yet to have any problems in that area. A sprint car engine is about as abusive as one can get, so if it lives in a sprint car at 8200 RPM, chances are its gonna live for anyone.

M.Harris 44H

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