So i ran into some snags trying to install this today. The ls7 style injectors i used have different sized upper and lower o-rings. The upper size work, the lower don't so i had to order an extra set of upper o-rings. Second, the holes on the bottom where you can attach bards for vacuum are NOT 1/8npt. They supply hose barbs that thread in fine but 1/8npt fittings go in about a thread or 2 before locking up. Im going to get a 1/8npt tap tomorrow to see if i can make it work. And third it doesn't come with the 5 screws needed to mount the cable brackets on the bottom of the manifold. I will report back with what size they are tomorrow.