How much compression gain is realized from using the .030 head gaskets in a HO 103? The stock compression is supposed to be 9.7 to 1. The old compression ratio was 9.5 to 1 and most results show a .2 to .3 compression ratio increase. I haven't found any specifics for the HO 103's. I'm in Denver so all of the compression numbers are a little skewed to start with.