TTY bolts aside... I would still torque down in steps, being an aluminum block and heads. It just keeps everything a little flatter when seating up against the gaskets. You'd be surprised how much warpage you can cause taking one bolt down to full torque, then moving to the next bolt vs. doing them in steps.

http://www.bnmotorsports.com "And I will strike down upon thee with great vengeance and furious anger those who attempt to poison and destroy my CEG brothers. And you will know I am the Moderator when I lay my vengeance upon you."