i'm about to finish my 383 build and going to get a mail order tune from pcm for less. i was wondering how much of a power increase could be expected by paying for a dyno tune, after i get the car running. thanks.

 

You'll definitly want to do a dyno tune after your up and running. That way, you can get it spot on. A mail order will get you close, but not where you can get it on a dyno tune.

Ken R.