Choosing the right heads for a 400 small block
You've finally got your hands on a 400-cubic-inch Chevy, but now you're staring at a bench full of parts wondering about the best heads for a 400 small block. It's the biggest small block GM ever cranked out, and while it's a total torque monster, the factory heads were usually the weak link. Most of the original iron castings were prone to cracking and had tiny ports that choked the life out of those extra cubic inches. If you want that engine to actually breathe, upgrading the heads is the first thing you should do. ...