X-Head Porting....

From the Chrysler Racing manuals, the best thing you can do is smooth the transition in the bowl under the valve and match and concentrate on the intake port divider wall. I also match the roof on the intake and exhaust port. Then I match the sides on the exhaust ports. I purposely do not touch the floor of either port. I also cc all the chambers and equalize them to within .2 cc of each other. I do not have a flow bench, I am not a head porter, so that is as far as I will go. I would also start with stones as they will remove less material until you get comfortable. Getting a variable speed control for your grinder is also a big help.