5.7 Tbi Vortec tune.

**Keith74** · 03-07-2018

Yep thats great if your vehicle is left hand drive, the range is huge. Sadly these trucks are not that common here and having being converted to right hand drive the steering shaft runs inches from the the right hand head limiting the free space for a quality extractor set up.

**Fast355** · 03-07-2018

Originally Posted by Keith74

Yep thats great if your vehicle is left hand drive, the range is huge. Sadly these trucks are not that common here and having being converted to right hand drive the steering shaft runs inches from the the right hand head limiting the free space for a quality extractor set up.

Header selection for an Express van is also VERY limited. The ones on my setup are actually for a short bus based on a cutaway van. Very little room to fit headers in there, but Thorley did a great job with execution.

https://www.amazon.com/Doug-Thorley-...rley+bus+heade

**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.