Yeah, all I can say is every combo is different. I know most of my bubbies have chevys and they just throw a big cam in and go fast. Wish I was that lucky. I still think these mw heads are making it more complicated than it needs to be to get the ideal cam. Something not right with the way they flow or the port shape, I don't get it. Normally I would throw a 275ish 680 0r 700 cam in it and be happy. My hunch is that the smaller @50 cam I ordered will work good with these heads as the added compression did. I will find out and have a better idea what size roller to throw in when the time comes.