Quote:
Originally Posted by Bored&Stroked
ARP head and main studs are not Grade 8 - lets start there. Their tensile strength is roughly 190,000 PSI (depending on the application and material) - Grade 8 is around 150,000. But, there is a lot more to it than just the grade - consider material, material sources, manufacturing processes, thread design, heat treating, etc.. ARP studs have rolled threads - you won't find those when you go to Tractor Supply and buy Grade 8 bolts.
By no means am I saying that every flathead needs ARP hardware (I am not in Sales!), but there are many differences between regular Grade 8 bolts (and who knows where they are manufactured, what type of materials, what processes, etc), vs ARP hardware.
Here are a couple links in case you're bored:
https://arp-bolts.com/p/technical.php
https://www.hotrod.com/articles/why-use-arp-bolts/ |
We are speaking the same language but from two ends of the spectrum. I’m going from the perspective of a standard(s) that categorize specifications for bolts to which manufactures must abide by, and you are assuming some or most don’t. For example, you infer hardware sold at places like TSC or HomeDepot are not what they claim to be. Maybe, maybe not. For example, Hillman sells to both, and they are not some flight-by-night operation. I will say, back in the day though working at General Motors Diesel Division there was a huge issue NA wide with sub-standard offshore hardware. I recall barrels of bolts etc, being discarded rather than taking a chance that it might be “ok”.