Some slant six valve covers
7 lb is noticeable and more than I imagined. I have the factory 1964 steel cover and didn't notice 4 lb (recall feels lighter). I painted with the "Metal Coat", which gives an irridescent color. The photo doesn't capture the color well, which is darker and closer to the cap. Notice I used a special silicone gasket which should last forever. The cast aluminum covers allow a more uniform pressure, though you don't tighten much with the silicone. I can't say how that paint survives engine temperatures since haven't driven that car yet (no convertible top yet).