The L83 is GM’s LT based direct-injected 5.3L engine that comes in every GM truck imaginable. They are plentiful, powerful, and reliable, and are now starting to show up in hot rods, muscle cars, and classic trucks. Stock they were rated at 355-380 horsepower and 383-416 lb. ft. of torque, but that’s with all the emissions equipment, accessories, etc. Typically all these GM LS and LT engines make more than their rated power numbers when they are configured for dyno testing or for installation in a muscle car or street machine. In this video Richard Holdener teams up with Brian Tooley and the gang at Brian Tooley Racing to do some testing with an L83 in hopes of making 500 horsepower with it. Intake, cam, and what else? What all does it take to make that kind of power with the L83?

Watch and you’ll find out.

Here’s the info from the video’s description.

HOW TO: 500-HP L83 MODS. CAN THE GEN 5, 5.3L L83 MAKE 500 HP? WHAT MODS ARE NECESSARY TO PUSH THE POWER LIMIT OF THE ALREADY IMPRESSIVE GEN 5, 5.3L L83 UP OVER 500 HP? CHECK OUT THE RESULTS OF THIS TEST WITH THE GANG FROM BRIAN TOOLEY RACING, WHERE THEY ADDED A SIMPLE CAM AND INTAKE UPGRADE TO COAX OVER 500 HP FROM THE 5.3L (BUT CHANGES WERE NECESSARY!). CHECK OUT HOW THEY DID IT!