Putting 823 heads on 5.3 LS engines - Does it work?
If you've been hanging around the LS world for more than five minutes, you've probably wondered about bolting 823 heads on 5.3 blocks to see if you can squeeze out some of that legendary LS3 power on a budget. It sounds like a dream scenario, right? You take the most common, dirt-cheap bottom end ever made and slap on a set of high-flowing rectangular port heads that can breathe like a marathon runner. On paper, it looks like a shortcut to 500 horsepower. In reality, though, things get a little more complicated once you actually start measuring parts and looking at how engines actually move air. ...