At the moment I'm building a 90 Gst. I have a list of all the stuff i will be buying for the car. But one thing i cant decided on is the mm of the head studs. ARP has a 12mm and a 10.5mm shanked and undercut head studs. Now my question is what is the differance between the two and what makes one better than the other? Also which one would should i purchase?


Heres the link to the website so yall can see what I'm talking about:
ARP Head Stud Kits

Thanks for the help!

-Justin