I've heard both sides of this issues, and don't know what to do. Will big duration cams cause blow through on a boosted motor, and then not produce as much hp? Would running a larger duration intake cam and a regular exhaust cam produce better results? I guess a vtec motor is a good example of this, as the vtec lobs have a pretty big duration. I think John said 290 deg? Don't b18 turbo motors make pretty decent hp....250hp+

Thanks,