Goin out on a limb here but since the heads whats changing unless for some freak reason the threads in the block would be different, i would go with the ones that match the motor the head your using is from since the length may be different. best bet is to call up arp help desk to be sure. you also dont want to use the stock torque specs with that kit. they can give you that info as well when you call. the number is 800.826.3045, they are quick to help ya out and ofcourse its free.