Index your spark plugs - this is an age old trick that is good for about 1 extra pony. The idea here is to "aim" the open end of the spark plug terminal (the gap) towards the intake side of the head. In order to accomplish this, simply mark on the plug a small line to indicate where this gap is, and install the plug as normal.

Try to line up the line with the intake side as best as you can. It may require buying 2 sets of spark plugs in order to do this, but hopefully you'll be able to do this the first time. Be careful with aluminum heads not to over tighten, as that could lead to a costly repair.

Taken from -> http://www.ultimateresourceguides.co...rticle103.html

There are some other "tricks" as well, but I'm not sure about what you'll really gain from them, but hey, like it says it costs "practically nothing".