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Old 04-03-2014, 06:51 PM   #1
 
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Default GM Vortec 8100

I'm about to start the search for a 2500/3500 or an avalanche with one. Anyone have any experience with it?
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Old 04-03-2014, 07:09 PM   #2
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they suck gas like craaaazy but make insane torque. something like 500ft lbs at 3500rpm. I have one in my boat. Very reliable motors.
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Old 04-03-2014, 07:15 PM   #3
 
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They're good motors, but as Jared said, don't expect anything more than 10mpg if you're lucky.
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Old 04-03-2014, 07:29 PM   #4
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8.1 is easily one of the best gas powered towing motors.
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Old 04-03-2014, 07:44 PM   #5
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I drove one for about 2 years, best truck I've ever owned. My father also used it to tow his 28 foot boat. I suggest you get a pick up and not the avalanche. The Avalanche did not come with the Allison transmission, but the pick ups did. Makes a huge difference. Also I did average 11mpg towing or not lol.
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Old 04-03-2014, 08:01 PM   #6
 
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I'm not worried about mpg. I don't have a long commute. I just want a toy to piss off my coworker. Lol. He has a 2013 Harley f150 with some loud, shitty exhaust. An 8100 with straight pipes should silence him. LOL
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Old 04-03-2014, 08:11 PM   #7
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The stock muffler is HUGE, I tore that shit out and welded in 2 magnaflow mufflers. Sounded beast afterwards.
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Old 04-03-2014, 08:13 PM   #8
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they're also not very mod-able FYI. Pretty fragile bottom end
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Old 04-03-2014, 08:26 PM   #9
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Yep, beyond stock is not advised
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Old 04-04-2014, 06:07 AM   #10
 
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There's a company out there that mods them. After owning a vette, their prices look pretty reasonable too. Raylar is the name I believe
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Old 04-04-2014, 09:14 AM   #11
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they're also not very mod-able FYI. Pretty fragile bottom end
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Yep, beyond stock is not advised
there was a dude on one of the suburban forums that built a home made turbo kit for his... seemed to move out pretty good too..
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Old 04-04-2014, 09:15 AM   #12
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Old 04-04-2014, 09:16 AM   #13
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Old 04-04-2014, 09:18 AM   #14
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im seriously surprised shit didn't just fall off this truck on some of these launches where it hops to the side.





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Old 04-04-2014, 09:21 AM   #15
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I know that truck KJ, it was awesome.
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Old 04-05-2014, 11:42 PM   #16
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Raylar 540 Stroker Kit - Chevy Suburban 2500 - Vo…:
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Old 04-06-2014, 01:24 AM   #17
 
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if I wasnt stuck on ls powered vehicles I would have found my truck with an 8.1 and Allison.
my buddy has the same truck as me with it and it does tow like a champ. he put long tubes on it with straight pipes literally going straight back from each header. its the only vehicle ive ever liked straight piped. rumbles like a damn Harley at low rpms
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Old 04-06-2014, 08:24 AM   #18
 
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Default GM Vortec 8100

The 8.1 has LSx style heads and the LSx firing order. ;-) it's like an LSx big block!

I found 2 local ones. An avalance for 9500 and a 3500 dually for 11.4k

Both have 120k miles

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Old 04-06-2014, 08:36 AM   #19
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the LSx has 3800 style heads....
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3800>all other technology ever
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Old 04-06-2014, 11:00 AM   #20
 
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the LSx has 3800 style heads....

3800>all other technology ever
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Old 04-06-2014, 11:00 AM   #21
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Dually ftw
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Old 04-06-2014, 11:03 AM   #22
 
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regular cab Dually ftw

Fixed it for you. If I pick this thing up, I'm gonna be ridiculously happy
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Old 04-06-2014, 11:17 AM   #23
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Jbigalows work has a reg cab longbed dually with the 8100 and row it yourself awesomeness

guys fight over it
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Old 04-06-2014, 11:19 AM   #24
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seriously look at the head bolt pattern and valvetrain...straight from the 95+ 3800
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Old 04-06-2014, 12:47 PM   #25
 
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Jbigalows work has a reg cab longbed dually with the 8100 and row it yourself awesomeness

guys fight over it

I'm picking up this one next weekend. A dude just looked at my Camaro and is bringing cash next weekend.
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