I'm building a 598ci Big-Block Chevy for my friend, Jeff. It's gonna be a bad mofo. The foundation is an aluminum block made by the folks at Brodix, right here in the good ol US of A! In this video I'll compare the lightweight block and a set of Brodix SR20 aluminum heads to old, cast-iron Chevrolet parts and show you how to take a couple of basic measurements so that you can order custom pistons for your next engine build. Wanna know the difference in weight between the iron and aluminum parts? Don't worry, I've got ya covered there, too.