ARP Cylinder Head Studs Toyota 2JZGEARP Cylinder Head Studs A must have for any motor seeing over 20 psi! These ARP head studs won't stretch like the stock bolts and will dramatically decrease the chanced of head gasket failure. ARP uses a premium grade 8740 alloy that is rated far superior to "aircraft" quality. Then, each stud is placed vertically in special racks and precisely heat treated to 190,000 psi. This procedure ensures complete heat penetration and the results are far
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