Big displacement, big compression, and a big tank of e85 help make this stroker LS run wild on Westech's dyno. By now we all know about GM's wonder mill, the venerable LS platform, first launched in 1997. GM has churned out millions of them over the decades in various sizes and iterations, from the smaller 4.8L version to the all-in performance 427-cubic-inch (7L) LS7. And while the LS7 is badass on many levels, even a 427 can benefit from extra displacement. Westech dyno wrangler and co-host of MotorTrend's Engine Masters, Steve Brule loves big-displacement engines, and he knows we love a strong LS engine, so it was a no brainer for him to send us over info on this 450-inch LS engine built by American Heritage Performance (AHP) for their customer Nate Ercse.