Orpedcrow
I'm Awesome
HT383e I think is what they call it and I remember seeing it available at summit. They (GM) claims a tune is not mandatory but recommended.GM does or did produce a new replace stock engine at 383 for 96 (vortec) V8's and later. Can't use it in 95 and earlier.
The HT383 without the “e” designation was for the pre vortec trucks.