So went and got a couple of new studs. The front stud is the 7/16 and the threads are nice and the stud holds strong. I just replaced that next stud because the nut was stuck to the old stud. Still gotta trim it.


Also because I was concerned with the rear stud strength and I just wanted peace of mind, I cross drilled it with this small bolt.


The bolt in the drilled and tapped hole


The stud with the cross drill and threading


The assembly all together and cross bolted.


69 Buick Special Deluxe. Intercooled Turbo Chevy 250 @ 15psi on a stock long block. It's kinda fast.