GM 4200 (4.2 straight six) swap into FJ62?

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I've seen it done in an 80 where it worked well. Looked almost factory too. I remember an issue with the oil pan but don't exactly remember.

However, the 5.3 is such a clean swap, it would be hard for me to consider anything else. See FJ60Cam's thread.
 
I m sure it can be done. The dimensions are similar to the 3FE. However, why would you do this over an LS (4.8/5.3/6.0) swap? The LS has more power and torque, and much more potential. Do you have access to the 4.2 for free?

Good luck with whatever you decide to do!
 
The alternative is a pre vortec tbi 350 in his case. The 4200 is in a trailblazer that can be parted out to make it very cheap to free. No cheap complete 5.3 vehicles at the moment. The 4200 is plenty powerful stock and if more is needed later a budget turbo build is not past my abilities.
Aftermarket pans are available for 4200's at this point as well.
 
Munchies said:
The alternative is a pre vortec tbi 350 in his case. The 4200 is in a trailblazer that can be parted out to make it very cheap to free. No cheap complete 5.3 vehicles at the moment. The 4200 is plenty powerful stock and if more is needed later a budget turbo build is not past my abilities.
Aftermarket pans are available for 4200's at this point as well.
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Free is good. Go for it!
 
If it can run a 4l80e then if should be able to run an NV4500 right?
 
cruisermatt said:
If it can run a 4l80e then if should be able to run an NV4500 right?
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I may be wrong, but I believe the atlas engines have a different bellhousing pattern than traditional GM engines. They only came with 4L60s. The 5cyl had a manual offering as well.
Again, my memory may be faulty here...
 
IMAG0326_zpsmceguugn.jpg


Here's the bell with the 4200 removed.
 
I'd like to see one off these conversions, I like the straight 6's. The wife drives a Envoy with the early version and I think it'd be a great fit power wise in a 60/62. Heck even the I5 would be a power upgrade!
 
Looking at the performance numbers, the '06+ makes more power than wasn't 4.8s and 5.3s.
 
White Stripe said:
As big as a 62 is, it really should have a v8, should have had one from the factory. I wouldnt mess with a straight six if you pulling the 3fe out. If your doing a motor swap go for at least 300hp. If you can't afford it now just keep saving up.
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The 4.2 has 295hp. That is a substantial increase over both the Toyota 6cyl and the TBI 350s that so many people have swapped in with great results.
 
White Stripe said:
Why tbi? Go for ls power. The LS motors are common and will likely have less hoops to jump through and probably cheaper in the end. If the ls doesn't have enough power you can find a ton of aftermarket support to make much much more power.
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I agree on the LS, over the TBI, but that's not what I was saying. I'm saying that many members have made that swap and were extremely pleased with the power increase over the stock 6. That leads me to believe that the, even more powerful, 4.2 is a viable swap.
Is the LS even better? Sure!
That doesn't mean that the Atlas series engines don't have some selling points.
 
I understand where you are coming from, but I don't think you are looking at the big picture.
With the Atlas we have a 295hp GM engine that can be had dirt cheap at any wrecking yard.
This is more than double the power of the 2F, along with modern fuel injection and efficiency. This swap would enable a daily driver to easily merge into high speed traffic and get better fuel economy.

The transmission is a non issue, because they come with the exact same transmission as the 1/2 ton LS powered trucks, except they use a proprietary bellhousing. This means that replacements (let's face it, GM light duty overdrives aren't the stoutest...) are available and cheaper than your truck versions. Aftermarket bellhousings and flywheels are available if you would like to run a manual.

The wiring harness is no more difficult than an LS V8. There are also plug and play kits available aftermarket.

You talk about performance upgrades? People are pushing these to over 600hp with boost. Not my cup of tea, but the option is there.

In summary, I think these have the potential to be a great swap option for the "do it yourselfer" on a budget. If you are strictly seeking power (namely torque) at any cost the LS V8 is a better option.
 
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