i installed ARP's in my H22a4 today. One of the studs sits a little lower than all the others and all were bottomed out properly.

Is this normal? the stud that was the lower one was the center stud on the backside of the block.

 

Yea that sounds about right. I had custom ones made for my h23a last summer and on my application some sat a little higher/lower then the others. If you call ARP and talk to Dave Clinton then i believe he still has the measurements from my block that i gave him as well as others since my application.