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Reload this Page Anyone own a GM 8.1 V8

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  #1  
Old 11-06-2011, 11:12 AM
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Montauk17 Montauk17 is offline
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Default Anyone own a GM 8.1 V8
Truck I am looking to buy has the 8.1 big block. Anyone own one? What kind of fuel mileage are you getting on the highway? I know it won't be good just want a general idea.
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  #2  
Old 11-06-2011, 11:13 AM
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Bout 12-14 tops. It's bad enough that they don't even post it on the Moroney(sp?) Labels when they are new.
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  #3  
Old 11-06-2011, 11:16 AM
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Bout 12-14 tops. It's bad enough that they don't even post it on the Moroney(sp?) Labels when they are new.
That is about what I figured. It will be a work truck so fuel will be charged to the customer. Have you heard of any major problems with that motor? I know the 6.0 had some crank bearing problems.
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Old 11-06-2011, 11:19 AM
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None to speak of. Not a whole lot of folks run this motor so, its hard for me to tell you for sure its a great motor. Never been told of major issues though.
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  #5  
Old 11-06-2011, 02:50 PM
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have you looked at a Cummings, I hate to say Dodge sells for less but they do but in the case of a work truck you can't beat a Cummings for pulling and get good fuel mileage
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  #6  
Old 11-06-2011, 02:54 PM
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Ryan, come buy my Dodge
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  #7  
Old 11-06-2011, 04:20 PM
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Ryan, come buy my Dodge
I need a 3/4 or 1 ton...cummins is a great motor,don't care for the rest of the truck.
Last edited by Montauk17; 11-06-2011 at 04:34 PM.
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  #8  
Old 11-06-2011, 08:13 PM
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The 8.1 is a 496 ci. Basically the same exact everything as the 454, which is as good of a motor as gm's small blocks. I believe its just a 4.75 stroke to get the lil extra cubes and they'll push out lil more horses and torque without having to max out any of the other rotating assly. If you get 14mpg youll be doing good.
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Old 11-06-2011, 08:38 PM
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I can call some TN guys tomorrow for ya and get the "scoop" if you'd like. I'm in touch with a lot of dealers regularly.
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  #10  
Old 11-06-2011, 10:09 PM
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The 8.1 is a 496 ci. Basically the same exact everything as the 454, which is as good of a motor as gm's small blocks. I believe its just a 4.75 stroke to get the lil extra cubes and they'll push out lil more horses and torque without having to max out any of the other rotating assly. If you get 14mpg youll be doing good.
This is true.
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  #11  
Old 11-10-2011, 12:19 AM
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I had a 2001 model 4x4 . 33" mud kings 8 mpg at best. Damn thing took over a gallon to start it. It was bad to the bone though.
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  #12  
Old 11-10-2011, 12:26 AM
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Brother in law had a 4x4, he couldn't get 10 mpg out of it.
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