Piston ???

A set of KB107's can be had for about $185 from places like Summit, Jegs or PAW. The Speed Pro CP116 piston is equivalent to the KB and will give you the same compression but is slightly more expensive because of the coating on the skirts.

Even the cheapy Speed Pros will raise the compression about a 1/2 point compared to the stock dished piston but the extra $50 for the KB's is well worth the investment.