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ARP SB Chevy 23 Degree Pro Action Head - Head Bolt Kit - arp134-3604 missing-image 000in) 2008 Chrysler PT CruiserIt 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, theres not a better stud setup on the market today. For openers, ARP uses a premium grade 8740 alloy that is rated far superior to aircraft quality. Each stud is placed vertically in special racks and precisely heat treated to 200,000 psi. This procedure ensures complete heat