Chevy 6.2 and 6.5. Why no love? - Diesel Truck Forum -
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post #1 of 31 (permalink) Old 01-30-2009, 10:36 PM Thread Starter
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Chevy 6.2 and 6.5. Why no love?

So i am relatively new to diesel. I've been playing with mud trucks for years and decided to start pullin. I hear the good and bad things about all the cummin's and powerstrokes. Yet when it comes to chevy diesel, i can't find anyone to say a good word about them all that way until duramax. So i ask, why no love for the 6.2 an 6.5? If anyone can help me out with why they are "junk" that would be awesome.
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post #2 of 31 (permalink) Old 01-30-2009, 11:23 PM
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They are the lightest duty diesels offered in a pickup.

Neither is abuse tolerant, this means that virtually ANY abuse from skipping an oil change to mile overheating will shorten their life.

They are essentially the same engine with different displacements, that's an over simplification, but reasonabally accurate. They are light and return good mileage when spec'd correctly, but underpowered and short-lived if spec'd wrong or over worked. Not what you expect from a diesel, sorta reminds me of the Olds 350D

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post #3 of 31 (permalink) Old 01-31-2009, 12:41 AM
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They are mostly popular for folks with a full size rig that are looking for better mpg than a V8 gasser. Think of it as a "Basic Transportation" engine.


my daily driver:67 F100, 300 4V, cammed, 4 spd.
or, 08 Subaloser Forester, 2" lift.
work rigs: 94 IH 4900, DT466(originally 230hp), #0 fuel plate, tighter gov springs, 22* timing
or, 06 IH 7400, DT466E, 300hp

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post #4 of 31 (permalink) Old 01-31-2009, 01:59 AM
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they are just cheaply made. poor casting on blocks and heads, the harmonic balancers fail causing them to break cracks. I personally wouldnt take one out my drive way. (there not that bad but you get the point)

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post #5 of 31 (permalink) Old 01-31-2009, 03:39 AM
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The later 6.5's aren't that bad...afterall they were used in the military HMMWV's. A little under powered (of course I was driving a 10k pound armored truck through the mountains). It's not a racing motor by anymeans.
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post #6 of 31 (permalink) Old 01-31-2009, 04:07 AM Thread Starter
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Well then, looks like i won't be buying me a chevy diesel anytime soon. Thanks for all the info. If anyone has any nifty tech stuff that would prove helpful to my new diesel tinkering self. Let me know, it will be much appreciated!!
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post #7 of 31 (permalink) Old 02-03-2009, 01:51 AM
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well if tinkering is what you want to do, the 6.2 or 6.5 is a great choice. they are cheap and very simple to work on. early 6.2 engines [82'/83'] had some head gasket issues. get the uprgade headbolt, problem solved. harmonic balancers with lot of age or miles can as mentioned lead to stress cracks, or more likely a broke crank shaft. this applies to both the 6.2 and 6.5 engines. 6.2 engines will pull any load a 350 will pull, add a turbo and it will run with a stock 454, [pre vortec]. i have/had both, as well as hauled alongside others. the 6.5 is a decent puller also, stick with the mechanical engines for reliability, computerized one's had some issues. wether 6.2 or 6.5, something to keep in mind, if it has a turbo, keep a close eye on egt's. 6.5 engines have a lillte think crowned piston, but both are subject to cracking from excess egt's, too often. rings get brittle also. as for maintnance, both will hold up better then any powerstroke when it comes to poor maintance. my oldest 6.2 had nearly 400k on it before breaking a crank [ see balancer advise] , and it had seen several 12/15k mile oil changes. after nearly a million miles of seat time behind trucks powered with these engines, not a single one left me stranded. i have used them exclusively in my farming and construction buisness, hauling anything from 1500lb hayrakes to 15000lb backhoes , frequently. while i would rather use one of my fords or dodges to do the serious towing these days, i still remember the time when a turboed 6.2 had to do all the pulling, and i still use it on ocassion.
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post #8 of 31 (permalink) Old 02-03-2009, 03:09 AM
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My only expierience was with a friend's truck the block was cracked around the main bearing cap bolts all of them, the rebuilder said this was common, with high mileage, hope this info helps, besides its a bow tie.............I would rather own the blue oval, what ever you do have fun with it, even if you need it for work!!!!!!!!

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post #9 of 31 (permalink) Old 02-03-2009, 03:58 PM
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6.2/6.5s are not nessesarily bad motors they are just in a different catagory as the PSD, Cummins, and D max. They are more of a lighter duty engine, they have decent power, but will never compare to the heavier duty engines. And can not survive when put under the stess that the other motors are built for.

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4" lift 4" exhaust and PMD heatsink

And a DT466 going into a 2.5 ton 6x6 army truck

put it in 3rd. gear & nailed it & it took off like a missile for about 50 ft. & then the turbo exploded kinda like a missile!!!
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post #10 of 31 (permalink) Old 02-03-2009, 05:15 PM
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Originally Posted by Tav View Post
The later 6.5's aren't that bad...afterall they were used in the military HMMWV's. A little under powered (of course I was driving a 10k pound armored truck through the mountains). It's not a racing motor by anymeans.
The military 6.5l engine is no longer produced by GM it is produced by AM GENERAL and is a similar but different motor than what GM produced. Check out these links.

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