I have had hundreds of Ede heads through my shop.
Not a one of them had “umbrella” seals.
The normal seal when they have single springs are the positive “ring and band” type.
The ones I’ve had here that had dual springs used positive steel jacketed Viton seals.
Edelbrock gave me the part number and Summit calls them Viton material and have Umbrella in their description. I am guessing that is due to lack of a better description.
