IMHO I'm running a gen1 gte with gen1 ge cams both intake and exhaust. It is a really nice complement to my ge side feed intake. I can tell you that my intake cam is .006 inch bigger then the gte and the exhoust is .010 bigger. Another member mentioned to set my intake advance 1 tooth and exhaust retarded 1 tooth for more air in and exhaust out. I will see when I get adjustable cam gears if it makes a difference