you could reuse the arp's. my headgasket went last year and i got a new mitsu metal headgasket and arp's. when i took the head off i noticed that the motor already had arp's in it. i swapped them out anyways and sold the old ones to a fellow gvr4 member, so they are reusable. after putting everything back together in my car i had i also had a problem with coolant being pushed into the overflow tank at high boost (20+). so i took the head off again, sent it out to get machined, new valve seals, and put it back together while still using the arp's. how many times can they be reused? i dont know but i'm assuming at least 3-4 times. how much did you torque them too? did you use the lube that comes with them or motor oil?