The castings are machined to a RMS finish. RMS stands for reletive mean squared. I remember having to open the machists bible to learn more. Today we can Google most anything including RMS finish.
Anywho... That little bit of roughness povides a tooth for bonding Stops the gasket from sliding.That can't be regained with a razor blade. It did remove the old gasket material. A brass wire brush and part cleaner removed the staining between and around the ports revealing that RMS finish. Alcohol, scotch brite, and clean towel is removing any residue. I'll try to remember and snap a pic. Too hot out there and my back goes away real quick. I'll get'er done eventually.
Reason I'm using these fancy gaskets is they were here, free, and dont match the port size of a 4 brl intake. When I do use the Edelbrock performer intake I'll need a different gasket/part number.
