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Vortec 4200 installation project #136860 Fri Jan 19 2007 06:21 PM
Joined: Dec 2004
Posts: 129
E
efi-diy Offline OP
Shop Shark
I'm in the process of building parts to bolt a late model vortec 4200 DOHC inline 6 into my '51 GMC replacing a just broken in 292 that for sale.

The vortec makes 275hp in full emmision trim from the factory! So in hot rod trim its closer to 300HP.

The work packages to do the installation are:
- Custom ford EDIS wasted spark crank trigger brackets and timing wheel designed to bolt onto the vortec with no mods.
- Modified oil pan and pick up
- change the throttle body from drive by wire to cable
- exhaust system
- engine wiring harness for the megasquirt EFI system.
- custom engine mounts

IF anyone else is doing a swap and wants to get rid of the GM electronics I can add extra EDIS parts to my machine shop order.

Re: Vortec 4200 installation project #136861 Sat Jan 20 2007 06:33 AM
Joined: Jan 2005
Posts: 164
C
CanyonAg77 Offline
Shop Shark
Oh my! My hat's off to you. I briefly considered this swap and decided it was electronically too complex for me.

Aren't there also issues with how the front suspension bolted to the engine?

Re: Vortec 4200 installation project #136862 Sun Jan 21 2007 05:58 PM
Joined: May 2006
Posts: 8,490
L
LONGBOX55 Offline
Master Gabster
The only components that bolt to the engine is the front axle center section on the 4x4 versions. Shouldn't be an issue using the engine with the 2wd oil pan.
You're gonna have to post some pix of the conversion, I know I'd like to see it installed.
GM had talked about producing a crate version of this engine, similar to their Ramjet efi engines. They were supposed to have a self contained computer, only needing power and fuel to run. Never have heard the reason why it was never produced. ohwell


Bill Burmeister
Re: Vortec 4200 installation project #136863 Mon Jan 22 2007 01:19 AM
Joined: Jul 2006
Posts: 23
4
41trokita Offline
Junior Member
How hard is it to find a bellhousing for this engine that will bolt to a T5 or 700R4? I know they make them but all of the 4.2's I have seen are mounted east-west and not north-south.

Re: Vortec 4200 installation project #136864 Mon Jan 22 2007 01:48 AM
Joined: May 2006
Posts: 8,490
L
LONGBOX55 Offline
Master Gabster
East-west north south? Do you mean front drive opposed to rear drive? The 4200 currently is only used in the Trailblazer and it's assorted clones. It's strictly a rear/4 wheel drive engine, longitudinally installed, no transverse. I don't know about the bellhousing pattern, but all the current versions are using the 4L60E trans, so I'd think it would be the same as the current smallblock.


Bill Burmeister
Re: Vortec 4200 installation project #136865 Mon Jan 22 2007 06:06 AM
Joined: Jul 2006
Posts: 23
4
41trokita Offline
Junior Member
I went to the dealer to look at one of these engines and the only thing they had was a Arcadia,New GMC Transverse mounted 4.2. All of the Older models had the 5.3 upgrade. If the standard trans used behind this engine is 4L60E then a 700R4 or any trans that will hook up to a sbc will hookup. All I need to find is flywheel and I will be able to use a T5.

Re: Vortec 4200 installation project #136866 Mon Feb 05 2007 04:42 AM
Joined: May 2005
Posts: 146
M
Mike Vee Offline
Wrench Fetcher
The 5.3 V8 was an upgrade from the 4.8, not to be confuse with the 4.2 IIRC. The Vortec 4200 (er, 4.2) is an all aluminum 24 valve I6 that has been available in the Trailblazer for a few years now. Part of the story with the good power number is in the variable timing exhaust cam. Lots of great info on inliners. http://www.inliners.org/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=3;t=000538
The bellhousing bolt pattern is unique to the engine family which includes an I4 and I5 engine.
It is an impressive six.
mv


46 Chev One Ton Panel - S10 Frame Project

"What if the Hokey-Pokey is REALLY what it's all about?" - J. Buffet
Re: Vortec 4200 installation project #136867 Mon Feb 05 2007 05:33 AM
Joined: Jul 2006
Posts: 188
5
5wests Offline
Shop Shark
All '02 Trailblazers had the longitudinal 4.2...ALL. In '03 they offered the 5.3 in the EXT or extended Trailblazer. They sold so many that they're a dime a dozen now. I had an '02. Ran good but the power band was in the higher rpm's. Without emissions, it should scream and get decent mileage. Let us know how it works out.

Re: Vortec 4200 installation project #136868 Mon Feb 05 2007 03:55 PM
Joined: May 2005
Posts: 146
M
Mike Vee Offline
Wrench Fetcher
EFI-DIY,
I'm curious why to went to the darkside for an engine management system. GM has some fully hacked 89-92 ECMs that give you reliabilty, DIS ignition, room for turbocharging if the future warrants it, etc.
MV


46 Chev One Ton Panel - S10 Frame Project

"What if the Hokey-Pokey is REALLY what it's all about?" - J. Buffet
Re: Vortec 4200 installation project [Re: Mike Vee] #345840 Fri Dec 07 2007 07:14 AM
Joined: Dec 2004
Posts: 129
E
efi-diy Offline OP
Shop Shark

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