Seller notes

Compatible with Triumph Tr4; It is for good reason that virtually every top professional engine builder relies on ARP Pro series head studs for their all-out competition powerplants. Simply stated, there's not a better stud setup on the market today For openers, ARP only uses premium 8740 alloy and a proprietary ARP2000® alloy that are rated far superior to "aircraft" quality alloy steels. Secondly, each stud is placed vertically into special racks and precisely heat-treated to 190,000 psi for ...

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