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 spark/injection may be incorrect due to computer using the different stroke in it's table/calculations? If I can get my bench harness LS Droid setup to work, then I'd definitely just use the ECM that is already configured for 4.8 after I delete VATS. I already bought an ECM setup for 5.3L with VATS removed, which in short term thought I'd try assuming it's even worth trying.