I have read some complaints on them on here. You only slide the top part of the mount back 1/2 inch or so and even less on the passenger side so I do not know where the 1 inch comes from. I know for a fact the ones I always built were even better than the DC ones and never had any complaints or issues. We sold them for 100 using their supplied small block spool type K-members each and did quite a few. I cannot say if the DC ones were bad or not. Just was trying to save the guy some $$$. I am sure some of the BB a-bodies here in Pa and Ohio still have the K members we built in them.