interesting fact, if you like texas-speed they make great heads for about $1300, but did you know lingenfelter sells their custom heads for the same price? food for thought, oh yeah, if you buy and lq4(in the case of you not finding an lq9), you could buy a set of good flat top pistons and install them yourself with a new set of rings to make an lq9. plus while your at it, you could put a bolt kit in it and run a hone through the bores to freshen things up.