Well, I'd like to add a CAUTION on my earlier post re: bumping compression. As Phreak appropriately pointed out the other nite, (over a hot steaming bowl of ramen...), there are RISKS associated with this type of "conventional" tuning practice... such as one performs with "reckless abondon" on a small-block, or generously toleranced cylinder head. Specifically, CLEARANCE! If you have a motor that uses "dished" pistons, such as may be necessitated by tight "squish" areas, where the valve to piston head clearance is MINIMAL... you don't have much room to "mill" a head and bring those valves any closer to that piston... additionally, many Toyotas, unlike many Hondas, have enough clearance to prevent contact in "OUT OF TIME" valvetrain situations, such as can occur when a timing belt breaks or "skips" very badly... but this "forgiving distance" may be eliminated with milling of heads. BIG head/valve/piston damage risk... potentially a complete show stopper if the piston head hits those valves... you could mill your way to a blown motor on the first crank, if the mod is done wrong.
(Of course, there is compression bumping related to valve timing... but similar risks must be considered... and such compression increasing techniques have their OWN set of technical considerations...)
Point is, you need to do your research, and make sure you don't go "BACKWKARD" with your tuning... LOSING power by being hasty... or WORSE... totally disable or destroy your car...
Thanks for making the point, Brian...
-crisp
