You can hog those magnum heads out some for sure. This is the best pic I could find at the moment. There is a large restriction in the bowl below the valve seat. You can see this comparison on the 2 Magnum intake valves pictured. On a well ported Magnum intake throat, a golf ball will snugly fit all the way in the port and sit on top the valve guide, where it will not even closely set that deep on a stock port. Don't mess with the short radius that much, but the other 3 walls of the port should pretty much go straight down from the valve seat, eliminating the bottle neck.

6868915-P5130231.JPG (234 downloads)
Last edited by GO_Fish; 10/13/11 12:42 AM.

Scott B. "I'm a self-made man... I started with nothing, and I still have most of it!" 68 360 rusty B'cuda 'vert (GO Fish)13.59@ 98.72 mph 69 340 GTS stock 14.18@ 95.60 mph 01 5.9L Ram 1500 Quad Cab 4x4 01 3.5L 300M 16.23@ 86.97 mph