Hey guys I'm new here and was looking for some advice and knowledge. I have an 08 avalanche 5.3 4wd. I recently had a local race shop build me a gen iv 408 stroker (approx 600hp) with cnc ls3 heads, mild cam, studded heads and mains etc. Factory ls3 intake, injectors and tb. My first issue is the only change done to the ecm is the DoD is deleted. The company that was supposed to program and tune the ecm keeps making excuses to not do it which makes me think they aren't capable so if anyone knows a reputable company that can program and put a great tune in it i would be grateful for a reference. The next problem is the crankshaft position sensor isn't reading the correctly. What do I need to change so that it reads the 6.0 correctly?

 

Where do you live it might help narrow it down for someone to help you

 

I apologize I live around Dothan, AL.

 

Atomic could probably help you.

RT