robbieroflcopter

Greetings,

What I have:
2000 Silverado with 5.3L V8 and 4L60E 4WD, Gen 3 LS and PCM obviously. Cable throttle body.

What I want:
LS3 of some style running on Gen 3 PCM. I understand there are some obstacles to overcome. I think I have the reluctor thing figured out via the Lingenfelter box. Also, the relocation of the various sensors doesn't bother me. I'm looking at this engine: https://blueprintengines.com/product...-psls4272ctfkb or something similar.

I'm looking at the dressed version because I understand the LS3 intake won't work with my 5.3L front drive accessories and all my old accessories have 200k miles on them.

My questions:
How do I solve the throttle body issue and keep my old electronics/cruise control working? I have cable now and obviously the gen 4 LS is drive by wire. Can my PCM run a DBW throttle body and make cruise/etc. work?
Will this engine with this oil pan/ front accessory setup even fit in the truck physically?
Can the gen 3PCM be tuned to control this combo? I would need a remote tune or one that comes with the engine that I could flash with HPtuners which I already have.

I figure there's got to be some gen3 silverado swap expert on here! Thanks in advance for the help. I think I've read everything on the internet about these swaps and still have questions!

shakenfake

Lingenfelter box bad. Just get a crank with the correct reluctor.

Just go get a truck intake and use a cable throttle body, will have to fab up a bracket for that. You could upgrade but why?
Yes it would physically work
Yes Gen 3 PCM can be tuned.

Seems like a lot of money for something that needs a lot of work...

strutaeng

I agree. It's a very nice engine setup, but it comes with it's own ECU and a bunch of stuff you really don't need. Its already setup for the 58X reluctor (don't need the Lingenfelter box). I think that setup is better suited for a car that didn't have an LS engine for a swap. Just add your drive by wire pedal and go. It has the car accessories, which are more low-profile. It obviously will work, but you don't have to run them on your truck. They are interchangeable on your current engine.

Your truck is already based on the LS engine setup, just the previous iteration of it.

A simpler approach is to just get the engine with the correct reluctor wheel (knock sensor and cam sensor conversion), keep your accessories (buy new ones if you want), get your ECU tuned for the larger engine displacement, choose your intake, keep everything stock such a gauges and drive by cable.

The only challenge will be getting an LS3 with the 24X reluctor. Will probably need to be custom built, or get the engine dissembled to swap reluctor. Or run the box, but I would try to avoid it, if at all possible.

How are you using your truck? Will probably need to upgraded other drivetrain like transmission and rear axle.

shakenfake

@strutaeng He needs a 24x reluctor not a 58x

We can worry about tranny and everything later lol

strutaeng

Yeah, I meant if he wants to run the ECU that the engine comes with, it's programmed for the engine, so that's what I meant 58X. But I don't think that ECU will work in that generation of trucks trucks. 🤔

I now just see the kit also comes with it's own electronic pedal...

I was going to mention that the Holley ECUs may be another option to run an LS3? Didn't @RDF1 say those have the option to run either 24X or 58X? I think it's just a matter of changing an input on the handheld interface, no? Those ECUs are powerful. 🤯

RDF1

Yea a holley terminator x max or dominator can run a 24x/1x 24x/4x 58x/1x 58x/4x or you don't even need a cam sensor input at all.. ​​​​​​​OP would be better off just having a 376ci engine built with a 24x/1x setup so stock PCM can control it.

or if you want you could have your original engine bored to a 3.898" and run a 4" crank to have a 383ci.
​​​​​​​Holley makes a bracket to sandwich between TB and Intake to hang a cable on. ​​​​​​​

RDF1

Woops. i just clicked on the blueprint link and see its a 427ci LS3 based engine. 4.070"x4.125"
Only issue i have had is LS3 blocks at 4.070" splitting sleeves even just on a mild 93 octane tune.

If it were me, Id just do a 416 out of a iron 6.0 block. $15k is a lot of money just for a engine.
You could get a Crank/Rod/Piston kit for $2300. That leaves a lot of money left over for everything else you need. For 15k id want to see a engine/transmission/Fuel system ready to go.

robbieroflcopter

Thanks for all of the advice. I'm leaning towards having someone build me a custom engine. I'm thinking I need an LS3 based engine with a 24/1x, truck oil pan, ls3 style cable driven throttle body and a tune I can upload to the stock PCM. Who would you guys recommend to build such a thing?

shakenfake

"LS3 style cable driven throttle body"
Does not exist. You just need a cable driven throttle body. There are no differences (at least none that really matter)

Just look up engine builders. Or buy your own parts and take it to a machine shop.

strutaeng

Where are you located OP?