im not sure about the CR to be honest
they are carl schmit 1308cc pistons and im using the metal head gasket
its running at the moment with the custom map it had from pitstop a few years ago, but that was set up for the eaton and smaller pulley, now i have the glader with 65mm pulley so im sure air/fuel will be way off. runs ok but sounds a little rough so i would rather something more suitable