Meh, I don't forsee sleeves ever rocking below some outrageous HP number, on the order of 600+ hp. For a street car I would go open deck all the way. The cooling characteristics, and the free reign for the entire sleeve to thermally expand will lead to a long happy street life.

If you want to run a closed deck sleeve for a drag monster, I think that is fine too. But the sleeves will have the ability to expand at the middle of the cylinder (where sidewall loading is at it's greatest), and will be pinched at the top.

-PHiZ