Sift together the dry ingredients and set aside.
Beat the eggs and beat in the sugar, beating well Add vanilla.
Beat in oil and stir in zucchini.
Blend the nuts with the teaspoon flour and stir in.
Fold in pineapple, if desired.
Gently fold the dry ingredients into the egg mixture.
Pour into 2 greased loaf pans and bake in a 300 degree F. oven for 1 hour.
Cool in pans for 10 minutes