bad things to say about the HD 8.1L vortec Chevy BB? - Page 2 - Pirate4x4.Com : 4x4 and Off-Road Forum
 
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Old 08-19-2015, 09:53 PM   #26 (permalink)
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Not a big GM fan and I would buy that if I needed the towing capacity on a regular basis. A good friend of mine has a burb with one in it and it flat rocks. Decent mileage for a big block and pulls without drama. I've never heard any consistent complaints about the 8.1. They respond well to tunes also.
One of our local fish cops had his leo truck tuned and brought it back in to get it turned down because he kept roasting the tires. He also had the speed limiter turned back on because it blew past 100 so quick. I think he was a wus!
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Old 08-19-2015, 09:58 PM   #27 (permalink)
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I have the 8.1 in my 2005 33' Super C motorhome (Kodiak chassis) Fully loaded with motorhome and trailer, 26,000 lbs, it will still climb the Grape Vine (5 Freeway) at 45 mph. Lots of power, lousy gas mileage towing (5-6 mpg!)
Just my .02$
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Old 08-19-2015, 10:41 PM   #28 (permalink)
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Great Deal.. I've got the same truck with the 6.0 and 4L80E with 130k and I wouldn't even think of selling it for less than $7000. Most trouble free vehicle I've ever owned. If you can pay for the fuel it will pull just as hard as the diesel boys.
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Old 08-19-2015, 10:56 PM   #29 (permalink)
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I had an 8.1 super 34ft C Jayco RV. I drove that shit 15,000 miles without the oil light coming on, or if burning a drop of oil. The 8.1 always had power even when towing 8000 pounds behind it. The 8.1 is an awesome beast, it does get shitty mileage. If I could drive it I would buy the truck in a heartbeat.
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Old 08-19-2015, 10:58 PM   #30 (permalink)
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If you found that same truck with a duramax, it would be at least 15k. 9k buys a lot of gas.
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Old 08-19-2015, 11:00 PM   #31 (permalink)
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I'm probably the only one that feels that those parts don't deliver. At my old company, headers, I cat back, a cold air intake and a programmer delivered 75 horsepower to the tires. I expect more from the price of a set of heads.
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Old 08-19-2015, 11:55 PM   #32 (permalink)
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bad things to say about the HD 8.1L vortec Chevy BB?

I have a 2002 Silverado 1500HD 8 lug/6.0L/4L80E and I wish I'd never bought it. I get 9-10mpg around town and the POS doesn't make any usable torque under 3500rpms. The 8.1L get the same or better mileage and has balls. My old 5.7L vortec truck would out tow the shit outta the 6.0L. 8.1L is a solid power plant...leave it stock, feed it fuel.


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Old 08-20-2015, 12:33 AM   #33 (permalink)
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Great Deal.. I've got the same truck with the 6.0 and 4L80E with 130k and I wouldn't even think of selling it for less than $7000. Most trouble free vehicle I've ever owned.
2001?

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If you found that same truck with a duramax, it would be at least 15k. 9k buys a lot of gas.
The type of miles i'm prone to drive sometimes, it would be seeing that 9k.

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8.1L is a solid power plant...leave it stock, feed it fuel.
That would be the plan. Wouldn't touch it. I miss my 5.7 because it had as much upper end and more, than my 7.4 does. But the 454 can tow nice / easy as snot and not blink once in the torque dep't. When loaded properly (below 8k for example) i can hardly feel the pull except up the Grapevine and even then... it's strong as an ox 60mph in 3rd. I've been extremely pleased with the 4L80E.
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Old 08-20-2015, 03:27 AM   #34 (permalink)
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My buddy has an 01 3500 dually with the 8.1. We towed 2 jeep from houston to moab with it and got a constant 6mpg. We grossed 23,000 lbs. The crank sensor is a pain to change but it seems like a good motor.
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Old 08-20-2015, 04:24 AM   #35 (permalink)
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I've got an 04 suburban 4L85E. The suburbans and avalanches got the 4L80E and 4L85E and the trucks got either the 5 speed allison or 6 speed manual. It's a great engine, but I'd throw a tune on it to kill the torque management and get a little more power. The best I've gotten from my suburban was 13 mpg, usually averages 11, and gets 6-7 towing. No complaints and I'm not a GM guy.
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Old 08-20-2015, 04:43 AM   #36 (permalink)
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Only bad thing. I don't have one for my 91.
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Old 08-20-2015, 05:11 AM   #37 (permalink)
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Have one swapped in my 79 3/4 ton with a 4l80e. Has been awesome for 3000 miles so far
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Old 08-20-2015, 05:21 AM   #38 (permalink)
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I'm probably the only one that feels that those parts don't deliver. At my old company, headers, I cat back, a cold air intake and a programmer delivered 75 horsepower to the tires. I expect more from the price of a set of heads.
So, wait...you didn't replace the heads? You just replaced some of the restriction in front of and after the heads???

The bolt-on-Bob is strong in this one
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Old 08-20-2015, 06:16 AM   #39 (permalink)
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No worse than my 7.4L is now with 136,000 on the clock. I get 12~13 on good day.
I've driven my dad's Chevy Express 3500 van to from PA to FL twice and up to ME. With the 7.4L in that and 3.73s I probably averaged 13.5 on the highway with 180,000 mi. Closer to 14.5 if I got good gas with no ethanol. It got an honest 16 when it was new in 1997. My family drove it from PA to CA and back.
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Old 08-20-2015, 07:14 AM   #40 (permalink)
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So, wait...you didn't replace the heads? You just replaced some of the restriction in front of and after the heads???

The bolt-on-Bob is strong in this one
Yeah we made headers and Backs. So we added a tune and an intake and picked up all kinds of power. that motor made more power with those parts than anything else we tested. And we did power packages for a lot of trucks and SUVs.
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Old 08-20-2015, 07:20 AM   #41 (permalink)
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Sits in a 2001 Silverado HD 2500 with only 16,000 miles on her.




What could it fetch / i don't have experience with a 496cid Vortec block.




Seriously good deal here? Clean longbed in white with super low miles. No other options besides the 8.1L which i believe WAS an option in Chev HD's before it was dropped in 2009. It made Class A motorhomes happy for roughly a decade..?

Dad's got a 2500 at the house, dually flatbed with that motor. It fuckin scoots, even with ~700 gallons of gas on the bed.
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Old 08-20-2015, 07:34 AM   #42 (permalink)
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Good to know. I'm running around in a 454 gasser with the 4L80E and i love it. Don't know which auto this 01 has.
my buddy has an 01 suburban 2500 with the 8.1
It has the 4l80.

it's a monster. I drove it a bit when my junk broke down in his neck of the woods getting parts.
Tons of power, but if you get rowdy you can watch the fuel gauge go down.

at that kind of price I'd not hesitate.
The only issue he's had out of his was a fuel pump that failed at 150K or somewhere around there. His is 2wd.
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Old 08-20-2015, 07:39 AM   #43 (permalink)
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Buddy of mine had one in a CJ-7 back in Ohio. On tons, running 42s, it was a beast of a rig.
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Old 08-20-2015, 08:11 AM   #44 (permalink)
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The bad about them, GM did not make enough of them. Also it is too hard to find one with a 6spd manual. I wish I could find an 8.1 ccsb 4x4 with 6spd manual.

Also i have read somewhere where some of the early 8.1 trucks did not have the allison. Im not sure of that, but you might check when you look underneath.
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Old 08-20-2015, 09:29 AM   #45 (permalink)
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I would buy it. I have been looking for that exact truck but 4x4 for about a year with no luck.
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Old 08-20-2015, 10:52 AM   #46 (permalink)
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Buddy of mine had one in a CJ-7 back in Ohio. On tons, running 42s, it was a beast of a rig.
Did he sell it here on Pirate? Could have sworn I saw something similar in the classifieds a while back.
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Old 08-20-2015, 11:21 AM   #47 (permalink)
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If you're buying it for the mileage on the truck, try and verify it really only has 16k miles.

Those gauge clusters are notorious for needing stepper motors and a lot of guys just swap the cluster for a used one and the used mileage is what stays. There's no other mileage storage but in the cluster sadly, the BCM mileage reflects what it reads form the cluster.

A carfax might show if it's been in for service before and corroborate the mileage.
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Old 08-20-2015, 12:06 PM   #48 (permalink)
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I had an '01 2500HD crew cab since new. It was lifted with 37's. I traded it in a year and a half ago on a dodge 3500HD crew cab. It only had 61,000 on it. The dealer offered me $7,000. I called a cousin that was interested and said if he wanted it he could have it for the same price. He said yeah, but that he didn't have the money. I said no money, no truck, and took the trade. A week later the dealership called him (because he had be looking) and told him about a clean '01 lifted truck that only had 61,000 on it(mine). They said they would let it go for $17,000. I was pissed.

The engine was awesome for a gasser. Had a ton of torque, and the Allison trans is hard to beat. The allison prior to '05 was a 5 speed. After it was a 6 speed. As mentioned, mileage wasn't great, but otherwise no complaints. There was some recall problem on the early ones, and the marine engines because the were burning oil.

It sounds like a good deal to me, though I would question the mileage. The mileage is stored in the computer, not the cluster.
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Old 08-20-2015, 12:53 PM   #49 (permalink)
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Also i have read somewhere where some of the early 8.1 trucks did not have the allison. Im not sure of that, but you might check when you look underneath.
Would love to but i won't be able to do a visual on the truck before the purchase. I know it's a steal for $6k or even 7k - however - sight unseen i can't see going that far up with an offer because i can't inspect the truck in person unfortunately.

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If you're buying it for the mileage on the truck, try and verify it really only has 16k miles.

Those gauge clusters are notorious for needing stepper motors and a lot of guys just swap the cluster for a used one and the used mileage is what stays. There's no other mileage storage but in the cluster sadly, the BCM mileage reflects what it reads form the cluster.

A carfax might show if it's been in for service before and corroborate the mileage.
A reputable online seller has it, so their reputation is at great risk if they offer something like this with non-corroborated mileage, i presume. I've bought from them before, just never into the thousands. I doubt i can verify over the phone for example, what trans it has and any indicators that the cluster has been swapped. All this info (lack thereof) is tantamount to my offer being for 'as-stated' just as their offering the truck is, as stated.
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Old 08-20-2015, 01:00 PM   #50 (permalink)
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I wouldn't even worry about what transmission it has- even if its just a 4L80 it would still be fairly bulletproof in that truck.
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