What is the best exercise to build the pecs minus machinery or weights?

I know that varying push ups like spacing your hands further away or putting legs on a sophisticated level works your pecs well. Also I know that dips are fitting. The problem i'm having is that my left pec is so much smaller and unusually shaped, when I tense, than my right one. I mean what the hell? What can I do to build it up?
Answers:
You should try doing push ups with your arms as far apart as you can. I have the reliable find for you, I don't know if you would consider this a machine though...

http://www.ultimatebodypress.com/
without any equiptment you can do it but you are restricted, as you stated pushups and dips will help but even dumbells will help significantly so i suggest getting a two of a kind of dumbells you can use to do arnold presss, and chest flies with and chest presses to help your chest build muscle and go and get lean
push ups near your arms spread wide
well push ups r better than zilch, but if u really wanna gain muscle, weights are a necessity

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