I'm looking into doing an engine swap soon and I want to keep the TPI on my car both for emissions and for familiarity reasons. The L31-R Vortec crate motor is really catching my eye as a perfect swap candidate, so I'm trying to research what I will need to do to get the computer up to snuff. Then it dawned on me today: I wonder if there is a tune out there somewhere that someone has already put together for this crate motor. It seems like a fairly popular swap candidate and I don't plan to change anything on the crate motor itself (keeping it stock).

If no one knows of a tune that exists for this motor, what is the stock 350 binary for my year? I can't seem to figure out which combination of letters is the binary I'd want. Does anyone also know how far off I'd be from a good tune with the stock 350 tune? A ballpark estimate would be great to know how much work I'd be in for rolling my own tune.

 

I wonder why they say not for the 1/2 ton...
EBL has a vortec/tpi tune that is a very good start.

 

The L31r was not emission tested in the 1/2 tons, it was only available in 3/4 and up. The only difference is the hardened exhaust seats and 4 bolt main.

OP, I have 2 but one is on the stand and neither are fuel injected.

 

You can also look into the Marine Vortec engine as well. It has more hp due to a different cam.

http://www.ebay.com/itm/Reman-5-7L-3...BVmWyY&vxp=mtr

 

What do you mean by EBL? I keep seeing that around as I search the forums but no one ever defines the term.

 

EBL = Embedded Lockers... A flash programmable x730 based ECM, found in 90-92 F-Bodys, and can be found/purchased at DynamicEFI's website. TGO user RBob is Mr. EBL, and is a major presence here supporting DIY tuning.

FYI, An EBL-P4 is on my very short list of needed items to get my L31/TPI/LT4HOT cam engine up and running.

 

I have the 8800+ GVW engine in my 1/2 ton Express van. Other than being 4-bolt main, hardened exhaust seats, a better crank, and single roller timing chain it is the same engine.

I have the marine cam, marine intake and 2.02/1.60" valves in a set of milled vortecs. It is quick for being in a 3-ton brick of an Express van.