Automobile(s): Unicycle Join Date Mar 2003 Location Where I park it Posts 11,009 Re: cheap power improvements to the 425... well, I want to open up the 425 a little... what I really want to do is an all out performance build on a 472/500 For the 425, as far as performance goes, I want to install the modified 472 intake manidolf (once it gets modified) and the rebuilt carb (once it gets rebuilt) th