These premium valve cover gaskets are designed specifically to work with Scott Drake classic aluminum valve covers which were modeled after the original valve covers fitted to 1966 Shelbys. They are made from high quality material for a durable seal and feature unique tabs located to perfectly mate with Scott Drake classic aluminum valve covers. Most valve cover gaskets compatible with small block Fords have tabs in the wrong location for use with these valve covers and require trimming. Will fit stamped steel valve covers, however bottom tabs must be trimmed.