Im building a 68 Dart with 426 and looking for any way to lighten it,reading everyones post is very interesting... I'll admit to going too far (timewise) but it was a challenge. I bought one of the Mopar crossram intakes and was surprised how heavy, just a click under 47 pounds. OUCH. So I looked it over and decided to put it on a diet, after many hours on the mill I pulled off over 7 pounds of aluminum. There are parts of that manifold that are over 3/4" thick, they dont need to be. I happened to have a mill so off I went whittling away. At first it was pretty straight forward, trim a little here and there then it got serious. I did this a few years ago and am looking for the photos of the aluminum pile that stacked up around the mill. lol