I've got a 1998 5.7L Vortec to play with. Looks like 1996 to 1999 is the year frame for this type? Are there differences in the years? Wondering if differant years can be re-flased or other displacements? Sure looks like my LT1 PCM...

On a side note, after I play with this for awhile stock... I got a crazy idea of COP like the LS engine! Have to look at wiring diagrams to see if stock harness could be used and how hard it would be to repin for 411 PCM.