Originally Posted by
Däs Schmoo
Higher compression pistons, flat faced valves, thinner headgasket. The stock rev limit is there for a reason. Unless you have strengthened the motor to handle the extra revs and are making power past the stock rev limit, leave it where it is.
of the three, i'd go with pistons. p30 or jdm itr's will put you in the 11:1 range. still perfectly streetable.