5.7 Tbi Vortec tune.

**woody80z28** · 03-08-2018

I'm running the stock 350 TBI and injectors with the "ultimate" mods at 20psi.

I had Hedman headers at first and they fit great but rusted out after only a couple winters. I put cheap stainless OBX headers on that fit like absolute garbage, but have held up well. I had to cut and re-angle the 4 tubes on the driver side and both collectors.

If you're worried about fitment, just bash em. I was amazed at an episode of Engine Masters where they tested power loss and it basically did not matter at all.
https://www.youtube.com/watch?v=azPKIjxmmdU

**Keith74** · 03-09-2018

That looks like a nice mod for the standard TBI Woody.
I think I will stick with the manifolds for now as they are trouble free and the car is not for racing.

**only_1** · 06-17-2018

I know this is an old thread but I am curious about your tune. There are a lot of undefined items when using the compare tool in TunerPro. I have a chip that I got from my tuner with the same undefined items. What software did you use to create your chip?
Perhaps yours is the AA mask?

**Keith74** · 06-19-2018

Hello Only_1,
I am use Tunner Pro to program.
I'm not real sure about the undefined items in the tune but it was used as a base point for a start as I couldnt find any tunes to start with for my engine. Yes it is AA mask to allow emulation as it would normally be $OD mask.
I have since developed a more refined tune for my engine since but it is based from this tune.