4.2 liter - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Derek.Matirne · 09-14-2015, 02:47 PM

Do any of you guys know if anyone has planted a 4.2 from a Trailblazer into there trucks?

EARNHARDT#3 · 09-14-2015, 02:48 PM

If that's the aluminum inline 6, those motors are absolute garbage.

68shortwide · 09-14-2015, 02:49 PM

Quote:

Originally Posted by Derek.Matirne

Do any of you guys know if anyone has planted a 4.2 from a Trailblazer into there trucks?

Not to put you down, but I have to ask why?

BrianG · 09-14-2015, 03:05 PM

Quote:

Originally Posted by EARNHARDT#3

If that's the aluminum inline 6, those motors are absolute garbage.

180,000 miles without an issue and still running strong, excellent fuel economy, tons of power... I really don't think the one in my Envoy is garbage at all. I've always wondered why more of these are not swapped into our trucks. Seems like it would be a fairly easy install and one heck of a great daily driver setup. They bolt up to the same drive train as the LS motors and we all know that swap has been done a time or two before, so the output end shouldn't be all that hard.

Derek.Matirne · 09-14-2015, 03:15 PM

I had a Trailblazer with this motor, and it was a good, solid motor... I'm sure some have had bad experiences with them, but who hasn't had a bad experience with a certain motor.... I like to be different, I don't care to do what everyone else is doing, hell, if a VW, had the power I would try and put one of those in my truck, just to be different....

cooperhw · 09-14-2015, 03:46 PM

I have heard of them breaking crankshafts but that is usually near or after 200,000 trouble free miles. Go for it.

tdangle · 09-14-2015, 03:50 PM

Sold my TB with the 4.2L engine in it earlier this year, 224K miles and no problems with the motor. Hope my Dodge Challenger Hemi lasts as long.

brad_man_72 · 09-14-2015, 09:07 PM

Mmmm $1000 oil pan.
There's better and cheaper inline 6s out there to swap.

Nitis · 09-15-2015, 12:35 AM

I thought I read somewhere that they were too tall for our trucks

hugger6933 · 09-15-2015, 06:44 AM

The oil pan is gonna be the problem. I'm sure some one would do the harness it might cost a little more than doing an LS swap but the oil pan was made funny then it has the axle tunnel for the front driveshaft. It would take a custom setup to get it even to sit down in the bay I think. Jim

**special-K** · 09-15-2015, 07:50 AM

This site is turning into 67-72swaps.com. Jeez, what has suddenly made one of the greatest motors ever built (proven by time) not worthy of the job it's done since 1955?

Nitis · 09-15-2015, 07:56 AM

Quote:

Originally Posted by special-K

This site is turning into 67-72swaps.com. Jeez, what has suddenly made one of the greatest motors ever built (proven by time) not worthy of the job it's done since 1955?

For me its I want the driveability simplicity whatever you want to call it of EFI

And lets face it if you want to go EFI on a SBC its not cheap compared to what you can pick up a drop out motor for

Matt Cramer · 09-15-2015, 08:39 AM

Quote:

Originally Posted by special-K

This site is turning into 67-72swaps.com. Jeez, what has suddenly made one of the greatest motors ever built (proven by time) not worthy of the job it's done since 1955?

A cracked block, in my case.

EARNHARDT#3 · 09-15-2015, 09:20 AM

Quote:

Originally Posted by special-K

This site is turning into 67-72swaps.com. Jeez, what has suddenly made one of the greatest motors ever built (proven by time) not worthy of the job it's done since 1955?

I'll stick with my simple 250 1bbl with HEI. Very simple stuff.

67c10rustbuket · 09-15-2015, 09:54 AM

This guy already did it... just follow his thread for all the details. Very well thought out and engineered build.

http://67-72chevytrucks.com/vboard/s...d.php?t=570856

NONHOG · 09-15-2015, 03:06 PM

Just started out reviewing these rigs (engines) by far my initial finds are positive. I'm looking at a Trailblazer or Envoy for a light duty off-road/small trailer puller.
I think swapping one in anything is cool. Certainly not boring.

57taskforce · 09-15-2015, 06:20 PM

Quote:

Originally Posted by Nitis

For me its I want the driveability simplicity whatever you want to call it of EFI

And lets face it if you want to go EFI on a SBC its not cheap compared to what you can pick up a drop out motor for

Factory Tbi stuff from a junkyard is pretty cheap... Just saying not trying to start anything

Nitis · 09-15-2015, 07:02 PM

Quote:

Originally Posted by 57taskforce

Factory Tbi stuff from a junkyard is pretty cheap... Just saying not trying to start anything

That is the most reasonable route for sure just not the support that other stuff has

It is one route I am considering for about 900 I can get a setup that is stand alone based on the original tbi setup. But most people can get a complete ls dropout engine for even less than that

If I could do one myself that would be optimum just don't really know how or where tonstart

RickDeVon · 09-15-2015, 09:53 PM

Quote:

Originally Posted by EARNHARDT#3

I'll stick with my simple 250 1bbl with HEI. Very simple stuff.

Yes Sir think I will do the same only I need to do the HEI...

CParnell · 09-16-2015, 12:20 AM

Working on it right now, but I haven't got far yet. They are a great engine and with a little boost they can make some serious power.

http://www.hotrod.com/how-to/engine/...ec-inline-six/

If it will fit under the hood of a 69 Firebird it will fit in our trucks.

NONHOG · 09-16-2015, 11:27 AM

Quote:

Originally Posted by CParnell

Working on it right now, but I haven't got far yet. They are a great engine and with a little boost they can make some serious power.

http://www.hotrod.com/how-to/engine/...ec-inline-six/

If it will fit under the hood of a 69 Firebird it will fit in our trucks.

That hood looks seriously reworked from stock, cool car. Years ago Car Craft has an article about a few 10 second Nova wagons powered by that engine.

CParnell · 09-16-2015, 09:13 PM

Good point, I never noticed the hood before.

09-14-2015, 02:47 PM	#1
Derek.Matirne Registered User Join Date: Sep 2015 Location: Haughton LA Posts: 75	4.2 liter Do any of you guys know if anyone has planted a 4.2 from a Trailblazer into there trucks?

09-14-2015, 02:48 PM	#2
EARNHARDT#3 Registered User Join Date: May 2014 Location: PA Posts: 1,417	Re: 4.2 liter If that's the aluminum inline 6, those motors are absolute garbage. __________________ 1967 C10, LWB, 250, Powerglide, PS, PB, 3/4 STATIC DROP

09-14-2015, 03:15 PM	#5
Derek.Matirne Registered User Join Date: Sep 2015 Location: Haughton LA Posts: 75	Re: 4.2 liter I had a Trailblazer with this motor, and it was a good, solid motor... I'm sure some have had bad experiences with them, but who hasn't had a bad experience with a certain motor.... I like to be different, I don't care to do what everyone else is doing, hell, if a VW, had the power I would try and put one of those in my truck, just to be different....

09-14-2015, 03:46 PM	#6
cooperhw Registered User Join Date: Oct 2014 Location: Mesa AZ (Near Phoenix) Posts: 2,302	Re: 4.2 liter I have heard of them breaking crankshafts but that is usually near or after 200,000 trouble free miles. Go for it. __________________ "Life is too short to drive a boring vehicle". Later, Wayne

09-14-2015, 03:50 PM	#7
tdangle Registered User Join Date: Mar 2005 Location: Jurupa Valley, Ca Posts: 1,210	Re: 4.2 liter Sold my TB with the 4.2L engine in it earlier this year, 224K miles and no problems with the motor. Hope my Dodge Challenger Hemi lasts as long. __________________ Terry 1970 Custom Camper/C20 , GM Crate 350/7004R, Dana 60, factory AC

09-14-2015, 09:07 PM	#8
brad_man_72 the boat guy Join Date: Jul 2007 Location: springfield mo Posts: 2,339	Re: 4.2 liter Mmmm $1000 oil pan. There's better and cheaper inline 6s out there to swap. __________________ 67, swb, fleet, tach, throttle, 5.3, 4l60e, 3.73's, fuel cell, 5 lug, p.d.b., 4-6 drop. great little truck 66, stevens drag/ski 18' silouette, 350, 2.02 doublehump heads. comp extreme marine 278 cam, vette 7 fin valve covers, old polished edelbrock intake, velvetdrive, casale v-drive, adj cavitation plate. 28, model a rpu project,

09-15-2015, 12:35 AM	#9
Nitis Registered User Join Date: Apr 2014 Location: NOR-CAL Posts: 1,134	Re: 4.2 liter I thought I read somewhere that they were too tall for our trucks

09-15-2015, 06:44 AM	#10
hugger6933 Registered User Join Date: Oct 2008 Location: Marianna Arkansas Posts: 7,280	Re: 4.2 liter The oil pan is gonna be the problem. I'm sure some one would do the harness it might cost a little more than doing an LS swap but the oil pan was made funny then it has the axle tunnel for the front driveshaft. It would take a custom setup to get it even to sit down in the bay I think. Jim

09-15-2015, 07:50 AM	#11
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: 4.2 liter This site is turning into 67-72swaps.com. Jeez, what has suddenly made one of the greatest motors ever built (proven by time) not worthy of the job it's done since 1955? __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

09-15-2015, 09:54 AM	#15
67c10rustbuket Registered User Join Date: Apr 2011 Location: Mustang, Oklahoma Posts: 2,806	Re: 4.2 liter This guy already did it... just follow his thread for all the details. Very well thought out and engineered build. http://67-72chevytrucks.com/vboard/s...d.php?t=570856 __________________ Dan <---(my name) 67 SWB C10 project "GEORGIA"-59 Brookwood 2dr wag...Next project-03 Tahoe 4x4 5.3 family ride-07 Hondur Accord, commuter car

09-15-2015, 03:06 PM	#16
NONHOG Registered User Join Date: Feb 2007 Location: Marana, Arizona Posts: 3,455	Re: 4.2 liter Just started out reviewing these rigs (engines) by far my initial finds are positive. I'm looking at a Trailblazer or Envoy for a light duty off-road/small trailer puller. I think swapping one in anything is cool. Certainly not boring. __________________ "I feel the need for speed!"... as soon as I am done with my nap.

09-16-2015, 12:20 AM	#20
CParnell Registered User Join Date: Feb 2009 Location: Calgary, AB, Canada Posts: 156	Re: 4.2 liter Working on it right now, but I haven't got far yet. They are a great engine and with a little boost they can make some serious power. http://www.hotrod.com/how-to/engine/...ec-inline-six/ If it will fit under the hood of a 69 Firebird it will fit in our trucks. __________________ 1968 GMC 910 Project Tommy 1974 Olds Cutlass

09-16-2015, 09:13 PM	#22
CParnell Registered User Join Date: Feb 2009 Location: Calgary, AB, Canada Posts: 156	Re: 4.2 liter Good point, I never noticed the hood before. __________________ 1968 GMC 910 Project Tommy 1974 Olds Cutlass



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