A 6mge with the 84+ high comp pistons. Should net about a 9.6 compression ratio. I know this has been done, but I don't remember if it was determined if the motor is still non interferrence. Someone from the yahoo days did this, they still with us? Anyone know for sure? Anyone know for sure if this combo will run on 91 octane? I'm expecting to have to use 94, but 91 would be cool.