makes power higher up, right? That means the GM847 is a more streetable cam even though the numbers are bigger? I might have a chance to get a GM847 even though I already have a cc306 and am trying to determine if it's worthwhile...

Also dont want to take a big hit on mileage. I'm getting 28 highway right now and know I'll loose a few miles, but dont want to like cut it in half Heard of people getting upwards of 25MPG with the cc306 and I'm using a 224/232 now on stock heads that will be pocket ported until I can afford nicer heads...

 

The Comp Cam is going to be more streetable, than the GM cam. The GM cam has more duration, and more lift, therefore would be rougher on the street.The tune is going to affect how streetable the cam is going to be also, dont forget about that. Both cams are going to pull really well on the top end, if thats what your wanting, and will lope nicely.