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Message: <blockquote data-quote="5.0kid" data-source="post: 959899" data-attributes="member: 10487">what are you looking at for this shortblock?  a 306 is just a 302 bored .30 over and 11.3:1 compression is a good little bump in compression.  if you are wanting a turbo/supercharger set up you may want different pistons to get a little lower of compression ratio.  You can always call them and find out more info for your own set up.let us know what you are looking for and we can help you make a better decision or you can give them a call and they can help too!</blockquote>