Sounds familiar.  I use AN bolts because they'll bend before they break.  
Elsewhere I use ARP stuff.
In a message dated 26/04/05 16:31:57 GMT Daylight Time, 
John.Deikis@med.va.gov writes:
> A friend in Ann Arbor who has been building pro race cars for about 100
> years once told me they NEVER use grade 8 bolts in any suspension pieces
> because they are more brittle than grade 5 and not designed to bend under
> shear forces.  He said you want these bolts to flex so you can replace them
> rather than suffer a catastrophic failure.  He said they use grade 8 where
> there are primarily tension-compression forces working on the fastener.
> 
> Thoughts?
> 
> JohnD
 
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