The price difference between hardened valve spring shims and cheap valve spring shims isn't that big of a deal. BUT people want to save a buck so they use the cheap ones.


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