The Newer Chevy 4.2 and 3.5....

[ThisGuyUKnow]

I work at the walmart tire center and I have been seeing alot of the chevy's with the AMC 258 i6 / 4.2l vortec I6 And the 3.5l(?) 5 cylinder. I was wondering (not that I am in the market to get rid of the AMC 258 i6 / 4.2l with MPFI) if anyone has seen someone adapt one of these into the cj. I especially think the I5 would be really cool to see in a cj.

 

[Cheepjeep85]

don't know about the colorado i-5 but the 4.3l vortec has been done. check this out The Chevrolet Small Block V6 Engine - Novak Conversions

 

[ThisGuyUKnow]

Cheby has a straight 6 out that is AMC 258 i6 / 4.2l the 4.3 is a v6. THe cheby AMC 258 i6 / 4.2l Straight six is pretty slick lookin under the hood.

 

[ThisGuyUKnow]

http://www.canadiandriver.com/articles/jk/images/vortec_4200_i6.jpg

 

[Cheepjeep85]

ah learned something new then, i had no idea they started makin another straight six.

 

[Sasquach]

4200
The Vortec 4200, or Atlas LL8, is a AMC 258 i6 / 4.2l L straight-6 in the GM Atlas engine family. It has four valves per cylinder, utilizes dual-overhead cams (DOHC) design, and features Variable Valve Timing on the exhaust cam, a first for GM Inline engines. Introduced in 2002 for the Chevrolet TrailBlazer, GMC Envoy, and Oldsmobile Bravada, the engine is also in use in the Buick Rainier, Saab 9-7, and the Isuzu Ascender. The engine was rated at 275 hp (205 kW) and 275 ft·lbf (373 N·m) until the 2006 model year when the GMT360 platform received an increase to 291 hp (217 kW) and 277 ft·lbf (376 N·m). The Vortec I6 engine was on the Ward's 10 Best Engines list every year since its introduction in 2002 through 2005.

Applications:

• 2002 270 hp (201 kW), 275 ft·lbf (373 N·m)
• 2003-2005 275 hp (205 kW), 275 ft·lbf (373 N·m)
• 2006-2009 291 hp (217 kW), 277 ft·lbf (376 N·m) (can vary slightly through the years due to the new SAE rating procedures)

It is also the platform upon which the Vortec 2800/2900 I4 and Vortec 3500/3700 I5 engines for the Chevrolet Colorado, GMC Canyon, Isuzu i-Series, and Hummer H3 are based. These engines are simply the AMC 258 i6 / 4.2l I6 LL8 minus a cylinder or two

 

[ThisGuyUKnow]

4200
The Vortec 4200, or Atlas LL8, is a AMC 258 i6 / 4.2l L straight-6 in the GM Atlas engine family. It has four valves per cylinder, utilizes dual-overhead cams (DOHC) design, and features Variable Valve Timing on the exhaust cam, a first for GM Inline engines. Introduced in 2002 for the Chevrolet TrailBlazer, GMC Envoy, and Oldsmobile Bravada, the engine is also in use in the Buick Rainier, Saab 9-7, and the Isuzu Ascender. The engine was rated at 275 hp (205 kW) and 275 ft·lbf (373 N·m) until the 2006 model year when the GMT360 platform received an increase to 291 hp (217 kW) and 277 ft·lbf (376 N·m). The Vortec I6 engine was on the Ward's 10 Best Engines list every year since its introduction in 2002 through 2005.

Applications:

• 2002 270 hp (201 kW), 275 ft·lbf (373 N·m)
• 2003-2005 275 hp (205 kW), 275 ft·lbf (373 N·m)
• 2006-2009 291 hp (217 kW), 277 ft·lbf (376 N·m) (can vary slightly through the years due to the new SAE rating procedures)

It is also the platform upon which the Vortec 2800/2900 I4 and Vortec 3500/3700 I5 engines for the Chevrolet Colorado, GMC Canyon, Isuzu i-Series, and Hummer H3 are based. These engines are simply the AMC 258 i6 / 4.2l I6 LL8 minus a cylinder or two

Exactly If my AMC 258 i6 / 4.2l or my 360 ever poop out on me I think I am going to find me a wrecked trailblazer.

 

[Kane]

I love my I5 in my colorado but the I6 would be a better and stronger choice. the I5 was only made os it would fit un der the short front end of the Truck. The I6 makes more sense since it will fit under the CJ.

 

[derf]

The only potential problem I can see is that the I6 is designed specifically to have the drive shaft for the IFS to go through the oil pan. Notice the front sump in the above picture and notice also the large round hole in it.

I'm betting that the oil pan and pickup would have to be changed to accommodate the factory position of the solid axle in the CJ. I don't know if anyone makes a rear sump oil pan and pickup for that AMC 258 i6 / 4.2l .

 

[derf]

So a quick search leads to another forum where it appears that a rear sump oil pan is being developed...

4200 rear sump oil pan - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum

 

[ThisGuyUKnow]

The only potential problem I can see is that the I6 is designed specifically to have the drive shaft for the IFS to go through the oil pan. Notice the front sump in the above picture and notice also the large round hole in it.

I'm betting that the oil pan and pickup would have to be changed to accommodate the factory position of the solid axle in the CJ. I don't know if anyone makes a rear sump oil pan and pickup for that AMC 258 i6 / 4.2l .

I changed the oil on a trailblazer the other day and checked that out. Very interesting would one from a 2wd have the same issue?

 

[BrockGrimes]

I prefer the 4.8l v8, in stock form with just a turbo added it put down like 600hp and like 590lbs, the says something for the quality of the stock engine.

 

[derf]

I changed the oil on a trailblazer the other day and checked that out. Very interesting would one from a 2wd have the same issue?

I'm just guessing but I would think that they would keep the same oil pan layout for the 2wd since they probably designed around it in the first place.

I would think that if there was a rear sump pan for 2wd, the guy in the link I saw wouldn't bother making one. But that's just me speculating.

 

[ThisGuyUKnow]

I'm just guessing but I would think that they would keep the same oil pan layout for the 2wd since they probably designed around it in the first place.

I would think that if there was a rear sump pan for 2wd, the guy in the link I saw wouldn't bother making one. But that's just me speculating.

Well the one I looked at it looked like the diff (if thats what its refered to on the independent suspensions) actually bolted to the side of the engine.

 

[ThisGuyUKnow]

I snapped a shot of the bottom of a 2wd that came through the shop. you can see the hole for the axle but I don't see how it would keep you from using in a cj

 

[CJKrawler]

I prefer the 4.8l v8, in stock form with just a turbo added it put down like 600hp and like 590lbs, the says something for the quality of the stock engine.

What year is this Brock? Is that any relation to the 5.3 in my '01 Silverado?

 

[derf]

I snapped a shot of the bottom of a 2wd that came through the shop. you can see the hole for the axle but I don't see how it would keep you from using in a cj

I think the issue is that the front axle may interfere with the sump in the oil pan. At least in the stock location. Although, if you have enough lift anything will fit.

If I was going to do that swap, I'd do some research on how the Chevy engine layout differs from the AMC I6 and get under my CJ to take a bunch of measurements to see what fits and what hits.