need info on swapping 4.3 to 5.7

[98_shortbed]

hey guys im new to this site and this will be my first swap. i have a 98' chevy 1500 with auto trans and vortec 4.3. i got a 5.7 from a friend and would like to swap. so my question is how hard will this be, and i herd also that i can use the same pcm, so what do i need to do to make this thing work???

[ScarabEpic22]

Welcome to the site! I assume you can do the grunt work on the swap, you're on here asking about the PCM stuff. Yes you can probably use that PCM but its a 98 vortec black box PCM that is very outdated. I would highly recommend doing an 0411 PCM swap, it allows you to run all the LSx OSs and the custom operating systems plus has finer control of tables. People report smoother engines and more power from using the 0411 PCM plus it doesnt have the 5800rpm hard limiter.

On the EFILive side of things, you could do it with a FlashScan V1 Commercial license (personal wont let you reflash Operating Systems which you will need to do) or buy a FlashScan V2. Basically the V2 is newer, has more in/outputs, and will allow for standalone reading and flashing without a laptop.

[98_shortbed]

thanks man, so were do i need to look to get this pcm??

[ScarabEpic22]

I would look online or at a local junkyard, you're looking for the PCM from an 01-02 Chevy Express Van as they are first gen engines using a gen 3 PCM. Im not sure about where else to get them, but Im sure you can probably get one from someone on here. I havent done the swap just heard lots of good things about it.

[ChipsByAl]

This PCM was used in the 99-02 Camaro/Firebird, the 99-02 Silverado/Sierra, the 99-02 Vette, the 01-02 Tahoe/Suburban/Yukon and the 01-02 Express vehicles with the 4.8, 5.3, 5.7 and 6.0 liter engines. There could be more, this is just some I know of.
Al

[ScarabEpic22]

Ah, thanks Al. Its just the calibration from the Express Van thats used. So pretty much any 99-02 LS1 PCM will work.

[98_shortbed]

cool thanks. i will start lookin for it, i got the motor yesterday, so i will start putin peices together here shortly. does anyboty know were i can get some kind of wiring diagrahm to fix the 4.3 harness to work with the 5.7?

[Lextech]

P.M. me your E-mail address and I will send you a copy of the wiring file.
I have never done a 4.3 to 5.7 swap but, 2 other people have told me that except for the 2 additional injectors the wiring is the same as the V-8.

Jeff

[98_shortbed]

ok i got a 0411 pcm out of a 01 express van, the guy needs a vin num to put in the pcm, would the vin from a 99' suburban work??

[ChipsByAl]

The VIN that is in it now will work if it is a V8 truck, if that is OK with the prior owner of the PCM.
AL