Is it easier to pull the engine/tranny to replace engine harness. I have an '05 LS3 427 with Stainless Steel Works headers and exhaust, absolutely no extra room. Even when removing trans cross member it only drops about an inch.
First let me welcome you to the forum , please go to the user cp and let us know your location , what year etc. Then post why you need to change the harness and any other pertinent information? Also I didn't think the LS3 was a 427 :surprise: Tell us more and help will be on the way. :blur: :ssr