I bought two sets for my small blocks because when using the better high port intake manifolds the valve covers sat on the intake runners causing bad leaks. I just used black silicone to glue them on my heads then used baskets on top for easy removal

1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27

Livin and lovin life one day at a time