Every Generation of General Motors LS Engine Ranked Worst to Best

6. Iron-Block Truck Engines (LM7/LY6/L96) – “Turbo It Till It Squeals”

Want boost on a budget? Look no further than GM’s heavy-duty truck engines. They’re cheap, iron-block tough, and everywhere. Sure, you’ll need to mod the intake ports and deal with the extra weight, but that’s the trade-off.

The LM7 is a solid 5.3L starter with 270–295 hp. But the real prize? The LY6 — a 6.0L block with 364 hp stock and serious tuning headroom. Just don’t expect razor-sharp handling with all that cast iron under the hood.