The CR483 is a drop in cam for stock spring height. Power range between 2,000 to 5,500. This cam makes loads of Mid range torque ! It just pulls hard! Stock thru 11:1 compression ratio. Has a very lumpy idle and makes smaller engines sound like the big boys! This cam in Screaming eagle 131 engines is Matt Smiths personal favorite because of the strong 160 plus Ft lbs of torque by 3500 rpm in these stock 131’s!