I have an RV-8 with an O-320 H2AD engine and if I push over so the G meter reads +0.7 G or less, the engine cuts out. If I pull back so the G meter reads +0.8 G or more, it runs fine. The fuel pressure never changes (5 psi.) when the engine cuts out. It feels like a loss of fuel flow because when I pull to increase the G load, the engine comes back on smoothly ? no back fire. I had my mechanic check the carburetor float level and look for any other possible cause, he found nothing wrong. It seems to me the engine should keep running as long as the G meter is reading a positive value (greater then than zero). My current theory is there is something wrong with the carburetor. Has anyone else had this problem with the O-320 H2AD engine?