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arp head bolts

  1. What happened to this head bolt

    Engine Swaps, Builds
    Soo, I started putting in my head and I got the bolt to 90 ft/lbs of torque and it popped real loud. I originally thought it broke off inside (almost cried), but it backed out just fine. Take a look at the pictures below and lemme know wtf happened. These bolts are new. Do you guys think my...
  2. QR25DE ARP Headstuds Part number???

    Forced Induction & Supporting Modifications
    Hey guys. I apologize if it's posted elsewhere but i've been searching and can't find the part number or specific application i need to order my ARP headstuds for... i've read i need the cosworth ones but i just wanna make sure i get the right actual part number. Thanks