i have a 99 7.4 with a 8.1 cam looking tune

[ppacpaully]

this truck is a 99 gmc 2500 with a 7.4 that was newly rebuilt with a 8.1 cam, the duration on the two cams should be different and should have vacuum problems and the hole timing curve should be off. i am very new at this and need some help getting started.

[BLK02WS6]

Have you gotten any help with this? Do you have stock tune files for the 7.4 and 8.1? I would compare the two - they might not be as different than you think...

[ppacpaully]

thanks for the idea.