I run the 12:1 dome but since the dealer shaved the top of the cylinder it screwed up the compression ratio. I went and tried her out again today with 100 octane...no change at all. She is still running way too hot from 1/4 to 3/4 throttle... back to the drawing board! [img]i/expressions/face-icon-small-mad.gif[/img]

 

I think your dealer should buy you a new cylinder. Their is no reason to cut the top of the cylinder, if you needed to raise compression you could change domes.