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Old 04-06-2012, 08:32 AM   #1
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Re: GMC 6.2 swap

being a GM guy my self and having far more experience with chevy motors the 6.2 would not be my first choice. Kind of a dog of a motor in my opinion but its just that my opinion others may differ. If I was going to go through all that trouble I would put in a duramax personally. One thing you have to know, and i got a first hand taste of this, is the cost of repair on a diesel is LOTS more than a gas motor.

I had head gaskets put on my 1 ton 4x4 dually about a year ago to the tune of 4300 dollars. Yes it was a gasket flaw from gm but they wont admit it and im well over 200k in it so it was all on me. I think its a great motor till you have to do something like that. I know the book hours call for I think 43 hrs to do the heads and for just 4 more hours i think you can replace the motor all together?

Yes it will probably cost lots more to put in than the 6.2 but if you going to keep it i think it would be more well spent. Not sure what your long term plans are but there is something to be said about gas motors... simple and available. I have a 366 in my ward gmc and i am casually looking for another 366 to go through and have it ready to install when the current one craps the bed?


Good luck with it.


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Old 04-06-2012, 10:42 AM   #2
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Re: GMC 6.2 swap

43 hrs isa bit much...should take half that... the 6.2 is ok, 6.5 is way more powerful, but eats more pass head gaskets cause turbo only on one side... i have 1 ton dualie 4wd with 6.5... also injector pumps usually only last 150k miles or so. today is starter change today so no work on bus..
you can easily put in the 454 if you want the gas hog...but thats another couple days of work as well...
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Old 04-06-2012, 11:33 AM   #3
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Re: GMC 6.2 swap

Boy, I think I'd keep the 6.2 for now. What you gain in power by replacing it you will likely lose in fuel economy. I sure understand how the 6.2 is gutless. They were a great motor for just making forward motion. If it didnt grenade in the first year or two, they generally were good. "Good" having a different meaning than the normal, everyday "good". LOL.
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Old 04-06-2012, 12:14 PM   #4
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Re: GMC 6.2 swap

Quote:
Originally Posted by id stitch
After all money is a tremendous factor.
Since when did that start? ;)
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Old 05-13-2012, 10:51 PM   #5
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Re: GMC 6.2 swap

I'd never go for another 6.2--unless it was gas! They are slow and gutless and in my opinion not even suitable for an anchor. On the other hand, the late model Duramax seems to be doing just fine. I have a friend who "chipped" one in a Chevy dually crew cab and swears he gets 25 mpg. I've ridden in the thing and it HAULS! Oh well, Ya pays Ya money an Ya takes Ya chances!
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Old 07-27-2012, 02:08 PM   #6
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Re: GMC 6.2 swap

Quote:
Originally Posted by opus
Boy, I think I'd keep the 6.2 for now. What you gain in power by replacing it you will likely lose in fuel economy. I sure understand how the 6.2 is gutless. They were a great motor for just making forward motion. If it didnt grenade in the first year or two, they generally were good. "Good" having a different meaning than the normal, everyday "good". LOL.
HAHAHA!!! Well, put!! That part about "If it didn't grenade in the first year" made me fall out of my chair laughing!!!
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Old 07-27-2012, 03:17 PM   #7
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Re: GMC 6.2 swap

Ha...kinda like the 6.9 IH. If you got through 60k miles without head gaskets, the thing would last to infinity. It was gutless too, but who cares. I have seen 6.2's with tons of miles on them. How they got there beats me but they did. Who wants a Duramax, etc. Close to $50k and its nothing but wires and electronic components. Give me a mechanical engine any day....whatever it may be! I'm hungry..........
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Old 07-27-2012, 04:49 PM   #8
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Re: GMC 6.2 swap

Yep! My 6.9L's got 138,000 on her now lol and that thing will burn some oil. I have to put at least a quart or 2 of Rotella 15W-40 about every 2-3 times in I drive it. lol And, like I said it gets horrible fuel mileage, and is really gutless at times. I have a 5.38 ratio in mine but that's the limit for it. If anything, I wish it had a lower 5.57 minimally now, because I put larger 11R22.5 tires in it. It came specd with 9.00-20's. So, I love it, and have so much money in it, I'll never sell it, lol but yeah.
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Old 07-27-2012, 04:53 PM   #9
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Re: GMC 6.2 swap

Gee...find a 9.0 and stick in there. That way you can have the same power but with more cubic inches. ;) No, the 9.0 was a great engine.
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Old 07-27-2012, 05:12 PM   #10
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Re: GMC 6.2 swap

HAHAHA!!! Yeah, I have a Dump Truck that has a 9.0L/MT-643 in it. It's an 87' S-1700. I like the 9.0L alot better than my 6.9L But, I fear of over working, or running it to high for a long time and blowing the head gasket on it. I've got to get some different gears for it too. It has a 6.14 and it'll do about 45MPH @ 3000!!! It sucks ass... lol I would love to find a 5.38/5.57 for it. Also, the Allison MT-643 on it, has it's first gear valve body set super high!! It will not shift out of 1st unless you hit 3100RPM's, I was told the city I bought it from did that to make it a better snow plowning truck. So, it's really a bitch to drive. lol
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