The stage six heads are decent. It all depends on what combo your running.They will work fine on a standard stroke 440 but if your running a hot stroker over 470 cubes plan on some porting to make them work.Indy would be better in this case.Think of an engine as an air pump.The more air in and out the more power you will make.Them 452 stage 5s out of the box are basically stock with more meat for porting.
