Not Ranked
When I was getting some polished SS intake bolts everyone was trying to sell me ones that would only have 3 or 4 threads of engagement, same old incompetent sheet. I ordered from ARP and now have 9 threads of engagement exactly as the ford racing instructions indicate. I doubt I will ever have a problem. When dealing with aluminium it is not the fastener stregth it is the aluminium strenght and you want alot of thread engagement and antiseize.
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