Quote Originally Posted by chris989 View Post
I have a 89 v2500 burb,
5.7, New GM crate "stock piston/heads"
Lunati 10180700
.437"/.455"
250/256.
Headman full length headers,
Edlebrock intake.
4l80- w/small block convertor
456 gear

Later today I will log a file and upload.

Is the C3 ecm problematic? Is there a better unit i can replace it with?
Ahhh and I thought this was a one off ecm that would run the 4l80E. Duh!