Fast355, interesting. I would have thought it would basically be similar to having the old school timing off as you adjust the distributor and may run rough due to it being retarded too far....

That's all it would be for, just an engine stand test. I was just curious if it would even run though being I'd think since the computer is configured for a 5.3L, therefore the timing of...

Am wondering if a 4.8L will run using an ECM configured for 5.3L and if so, how well will it run. Basically, I bought an ECM configured for a 5.3L with VATS disabled thinking I had a 5.3L. But it...