[Bobcat]

The factory painted the heads the same color as the block back in the mid 60`s . I haven`t had any flaking , but I don`t think I`m using the same paint as you did . I used the Krylon #1618 ... and it doesn`t flake , but does turn dull around the exhaust ports ( constant hi temperature ) and has to be touched up every winter . Maybe some of the others who have posted may have a good method for getting the paint to adhere to the heads .... and save me some work .
Just thought of this ... are your heads aluminum ?? If so , they have a pretty good expansion and contraction rate , which could account for the flaking . Robert Pond told me to not paint his aluminum block as it wouldn`t adhere .

Bob