Ok, so explain better your statement. By the way I was the senior metallurgist in one of the major independent test labs in the south for 34 years, so we speak the same language.
I prefer to use new fasteners in critical applications.
My M120 V12 will likely be getting all new bottom end fasteners after it comes apart for inspection. I do have length specifications for the bolts but would rather spend a few bucks for the peace of mind.
On a related note, it's interesting how far down the single use fastener road Mercedes has gone. All kinds of stuff has single use bolts now. Brake calipers, flywheels, heads, cam caps, main caps, rods, turbos (yellow metal alloy), and many other bits all require fastener replacement.
