Swapping out a 99 L29 454 for a E85 Carbed high compression stroker 503

[99 7.4 C/C 4x4]

I'm gathering all the info to do a engine up grade in my 99 crew cab 4wd.
I have a freshly built 12:1 comp Gen VI block bored & stroked, 781 heads, with a 850cfm e85 carb.
Ive never done a vortec to carb swap and have a few question on what if anything that needs to be done to the computer/ECM in order for the ignition and transmission to work properly???
Any info would be greatly appreciated....

 

[Keepinitoldskool]

Im betting that your best bet for ignition is swapping the dizzy for a vacuum advance dizzy. As for the trans I would suggest a stand alone controller poor having the ecu retuned to eliminate all but the required trans signals.

 

[99 7.4 C/C 4x4]

yes I will be using a msd vacum dizzy. Is ignition wire the pink wire from ignition to dizzy, like they are on the older square body's ?
I will look into the stand alone controller. Thanks
Anyone know of any good deals on one?

 

[Blue95]

You will have to have the stand alone controller, that is $$$$ should be able to get all gauges to work correctly still no issue.

 

[454cid]

Before going to a standalone transmission controller that costs almost a grand, I'd find out what the ECM needs from the engine to run the transmission. It might be that you could hook up a TPS, and other sensors and be done with it.

 

[99 7.4 C/C 4x4]

Thanks I will plan on doing that first.

 

[GMRedline]

I don't think you would need a stand alone. Your PCM is support by EFLive and HP Tuners.

I am sure this guy can answer all your questions.

Check out black bear performance dot com

12:1 and E85 is going to rock.

 

[99 7.4 C/C 4x4]

I don't think you would need a stand alone. Your PCM is support by EFLive and HP Tuners.

I am sure this guy can answer all your questions.

Check out black bear performance dot com

12:1 and E85 is going to rock.[/QUOTE


Cool, I will look into Black Bear Performance. Yes the 12.1 on E85 should make this thing a freaking BEAST!!!!!

 

[99 7.4 C/C 4x4]

Ok so I've got the ignition and tranny figured out. Anyone ever run 2" primary headers with 3.5" collector? If so how did you route the exhaust??