2005 4.3

[theheathen]

i have a 05 chevy truck with the 4.3, i love the truck but id like to swap over to a v8 ive been told that the 350 is the easiest swap. could y'all tell me what year is the best direct swap.

[S/C Z71]

Not in an 05. Go with a 6.0.

[WhiteBrow24]

in an 05 go with the 5.3 or 6.0 all depends on how you wanna use it on which motor to swap in

[tehgregzor]

Are you wanting the easiest? Or do you really just want the flexibility of a 350. Pracically every part of that motor has something you can do with it, more options than almost any other motor. Yeah, a 6.0 is a little bigger, but parts for it can't be had at the local oreily's as quickly when something goes wrong.

[thrasher88]

ok sounds good i was under the impression that the with the 4.3 it was easier to go with the 350. i wish i wouldnt have sold the 6.0 i had for 500.

[hornsfan10609]

In the OBS trucks a 5.7 is an easy swap, in an 05 a 5.3 or 6.0 is a much easier swap than a 5.7. Too bad you sold that 6.0 already.

[thrasher88]

i might be better off selling this truck. what would a 05 4x4 with 4.3 5spd and 84k be worth?

[04SilveradoMykk]

technically it's easiest to go with the vortec 350 swap. However odd to go backwards a few years in engine. The Vortec 350 has a similar fuel injection as the new 4.3L. The 4.3L motor mounts will work with a vortec 350 unlike a LS based block. The 4.3L fuel lines will bolt right onto the Vortec 350 and all the 4.3L accesories will bolt to a Vortec 350... you will need to wire in 4 extra wires for the two more fuel injectors plus a comp tune.

Hell I even think the 350 exhaust manifolds dump in the same place as new 4.3L so you can use your existing Y-pipe. ( I think, I could be way wrong)

[theheathen]

thats what i was thinking i heard. i already have a wait4me tune so i could probally have it reflashed for the 350. does anyone know a year range im ready to start lookin. may be my project for my tax return.

[S/C Z71]

technically it's easiest to go with the vortec 350 swap. However odd to go backwards a few years in engine. The Vortec 350 has a similar fuel injection as the new 4.3L. The 4.3L motor mounts will work with a vortec 350 unlike a LS based block. The 4.3L fuel lines will bolt right onto the Vortec 350 and all the 4.3L accesories will bolt to a Vortec 350... you will need to wire in 4 extra wires for the two more fuel injectors plus a comp tune.

Hell I even think the 350 exhaust manifolds dump in the same place as new 4.3L so you can use your existing Y-pipe. ( I think, I could be way wrong)

You made some good points there man! :thumbup: They put Vortec 350's in NBS trucks in Mexico as well so the 350 may be easier after all. :dunno:

[98GreenMachine]

Most people are forgetting, or perhaps don't realize, that the 4.3 that is still being used today is a Gen1 engine, not a Gen3. As mentioned, it uses alot of components that are far more compatible with the 5.7 then they would be with a 4.8/5.3/6.0 engine.

[Silverad04]

If you go with an ls based motor, put a 6.0 in!!! 5.3 is a waist for an engine swap unless you can get it for next to nothing.

[04SilveradoMykk]

I've been thinking about this 97-98-99 Vortec 350 swap. In stock form the 350 wouldn't be worth the swap. I think they were rated at 250Hp & 260 ft/lbs-tq. Wich is only 50 more HP & 40 more TQ than the newest 4.3L... However there is a 350horse GM crate vortec 350. Or even stroker kits to 383, A stroker with a cam, full length headers & exhaust with that comp tune you'd have to do anyway. I could picture a 350-400 horse small block. Wich is the limits for the poppet valve fuel injection anyways. And it will sound a hell of alot better going down the road too

Hmm... very doable

[TEE]

Wouldn't be worth it JMHO....
Get another truck :)

[98GreenMachine]

I've been thinking about this 97-98-99 Vortec 350 swap. In stock form the 350 wouldn't be worth the swap. I think they were rated at 250Hp & 260 ft/lbs-tq. Wich is only 50 more HP & 40 more TQ than the newest 4.3L... However there is a 350horse GM crate vortec 350. Or even stroker kits to 383, A stroker with a cam, full length headers & exhaust with that comp tune you'd have to do anyway. I could picture a 350-400 horse small block. Wich is the limits for the poppet valve fuel injection anyways. And it will sound a hell of alot better going down the road too

Hmm... very doable

a late model L31 produced 255 HP / 330 TQ.

If you wanted to be nice and clean, get a HT383E crate motor. All you will need then is a intake manifold and injector setup(can be found for cheap these days), some minor wiring(or better yet just go with a painless wire kit), and a reflashed computer.

[S/C Z71]

In stock form the 350 wouldn't be worth the swap. I think they were rated at 250Hp & 260 ft/lbs-tq.

255 and 330.

[04SilveradoMykk]

I'd like the add another tick mark in favor of the 4.3L to 350E swap

I'm here at the auto parts store that I manage, and I have up on my split screen in the cataloging of the computer system a 2004 Silverado 4.3L and a 1998 Chevy 1500 5.7L

the ignition controle module
crank position sensor
magnetic pick-up/cam position sensor
throttle position sensor
IAC motor
coolant temp sensor

...Are all the same exact part number between both years & engines. The only different sensor between the two is the knock sensor.