run 10:1 compression, you will be much happier. With engine technology and all the guages and meters we have now days you would be able to read detonation WAY before it ever occured. 9:1 is a safty compression for back in the day. You can make more liner power, as well as more power on less boost with the higher compression. Unless you just want to brag about how much boost you are running. Linear power ownes a power spike.