- Location
- Idaho
I have been searching a bunch of threads and read about some irregularities with compression stated on ADA website vs. actual compression. I am getting ready to install the girdled head on my SXR. Currently the only other engine mods are aftermarket arrestors and a wetpipe with 6 degree jumper. I want it to run safely and reliably on 91 octane but am a little hesitant with the 6 degrees of advance. ADA website states that the 32cc domes will bump me up to 180lb for 91 octane. Everyone that I read about states that they are running 28cc domes for pump gas. Since non of the older threads resolved this, does anyone have any info? Pretty much the only reason for the head install is for cylinder support.