New Gen 5 LT4 / 8L90 standalone wiring harnesses are now available! Thinking about swapping the all new 650 HP Supercharged 6.2L Z06 engine into your project? Rest easy - we have your engine and transmission wiring covered! These new Gen 5 harnesses still feature our familiar 3-wire hook up: battery, ignition switch, and fuel pump - and it's running!

Check out the video to see our wiring harness on our in house LT4/8L90 harness builder engine and transmission - just like every harness from Speartech, each LT4 harness will be built on this setup and test ran to ensure proper functionality before shipping!