Chevy studs may not work right. Butler sells several sizes of screw in studs. I'd suggest calling them. Measure the ones you have and see if Butler has the same ones. I had some heads that were machined for screw in studs but the studs were probably chevy studs and needed washers under the nuts to allow them to be snugged down and adjusted properly. I used some Lowes grade 8 washers that ended up being noisy because they were probably too big. Butler also sells special washers.