Just to add, try and find this dimension. I had a few years of grief with pulled case studs till we found the cause. The studs looked fine, short threaded section at the top, the problem was at some point a couple of studs where fitted upside down, then the DPO in the end couldn't fit the rocker box and then cut the stud top off to BODGE the fit. So then it by eye looked fine,except it had the original short thread in the case and an even shorter thread up top looking standard but overall length was shorter. Its a huge fuck up thats hard to pick with less thread in the case,= pulled stud. Back then the toque used on the head was higher then needed as well adding to this nightmare.