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If you don't see a headmark, you don't know.
If you didn't install the fasteners yourself AND log the unstretched length it makes sense to replace them. Even ARP fasteners have a yield point and if stretched into the plastic deformation range will be permanently longer (and thinner). The trouble is, if you don't know the pre-installed length you don't have anything to compare to.
In the context of an engine rebuild budget of time and dollars a new set of rod bolts is a minor item. In the context of critical parts, it is a major item.
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'66 911 #304065 Irischgruen
‘96 993 Carrera 2 Polarsilber
'81 R65
Ex-'71 911 PCA C-Stock Club Racer #806 (Sold 5/15/13)
Ex-'88 Carrera (Sold 3/29/02)
Ex-'91 Carrera 2 Cabriolet (Sold 8/20/04)
Ex-'89 944 Turbo S (Sold 8/21/20)
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