454 vortec...good or bad
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454 vortec...good or bad

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    Senior Member H20MOFO's Avatar
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    Default 454 vortec...good or bad

    I dunno ..I'm looking at a 1996 4x4 dually with a 454 vortec . It's getting up there mileage wise. Whats your thoughts on a vortec 454 ? Good, bad? Is that considered a gen 5 bbc? or??
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    I have a 98 C-3500 dually with a Vortec 454. Great motor and runs strong with gobs of TQ. The only weak link is the peanut port factory heads and the sprinkler style fuel injection. I think I am going to swap on a good set of aftermarket heads and change out to an Edelbrock Pro Flo EFI. Already running Thorley headers and custom exhaust with an intake and tuner.

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    Senior Member H20MOFO's Avatar
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    Thanks for the info, he claims about 10-11mpg does that sound about right.. anyone?
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    That's about right-10 mpg whether loaded or not

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    Senior Member carreradude's Avatar
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    Hell, my 2004 8.1L gets about that. Maybe 11mpg

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    Purple headed member Quickjet's Avatar
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    Quote Originally Posted by H20MOFO View Post
    I dunno ..I'm looking at a 1996 4x4 dually with a 454 vortec . It's getting up there mileage wise. Whats your thoughts on a vortec 454 ? Good, bad? Is that considered a gen 5 bbc? or??
    It's a Gen 6. Probably one of the best. All the Gen 4 stuff bolts on and it has the better oiling that the Gen 5 offered. The Gen 6 doesn't have the one piece rear main seal that the gen 5 had which is good. The Gen 5's were known to leak in that area.
    The Gen 6 is basically a well oiled Gen 4 without a fuel pump provision. '96 was the first year of the Gen 6 Vortec and they are great motors. The trannys on the other hand were the weak link..........
    Check to see if the trans has been replaced (should be a rebuild tag on it if it was). Those tranny's will go out. I had bought a dually with 96,000 miles on it and it already the tranny replaced. I had to change it again @ 130,000 miles. My friends who have duallys have had similar experiences.
    And don't forget the fuel pump. If it's high mileage find out when the pump was changed. Those older trucks kill pumps. They are a lousy design.
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    mo balls than $cents$ IMPATIENT 1's Avatar
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    put a dizzy gear in it the day you buy it, just trust me on this or you'll be breaking the starter ear off the block

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    Senior Member H20MOFO's Avatar
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    Thanks guys, I'm a vortec virgin I'm pretty sure I must have a screw loose too. The guy with the 96 is asking 5k, for some reason I keep going back to this 1980 beast, I'm having a hard time getting this guy under 4k. I just hit another guy with a lowball offer on a dropped 98 crew cab dually, he says it has a 4l80 tranny? Does that tranny have an overdrive???
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    I agree on the fuel pump on the Vortec BBC's. I put one in my dually at about 90,000. My dually is at 106,000 now and still runs strong. Tranny still shifts beautiful. It's slammed 5/7 with 17-inch Brentz wheels and bright red with graphics. It has the GMC nose and a billet insert with a Gaylord cover and Line-X bedliner. Full Audio system as well. Dually's are cool!!!!

  12. #10
    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by H20MOFO View Post
    Thanks guys, I'm a vortec virgin I'm pretty sure I must have a screw loose too. The guy with the 96 is asking 5k, for some reason I keep going back to this 1980 beast, I'm having a hard time getting this guy under 4k. I just hit another guy with a lowball offer on a dropped 98 crew cab dually, he says it has a 4l80 tranny? Does that tranny have an overdrive???
    4l80e , and yep its a 4speed

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    "if u aint first yur last havasucat24's Avatar
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    the truck should have a 4l80e tranny in it meaning electronic

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    Senior Member Hullshot's Avatar
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    I got a 96 1 ton 2 wheel drive. Its got a 5-7 kit with 18's. I tow with it only. Yes the fuel pump has been repalced twice and it did get a new trans at about 45k. Is there any performance mods that actually work to gain power and keep the shitty 9-11 mpg? Exhaust is the only thing I have on it.

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    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by Hullshot View Post
    I got a 96 1 ton 2 wheel drive. Its got a 5-7 kit with 18's. I tow with it only. Yes the fuel pump has been repalced twice and it did get a new trans at about 45k. Is there any performance mods that actually work to gain power and keep the shitty 9-11 mpg? Exhaust is the only thing I have on it.
    cold air intake kit and a airraid spacer under the tb is bout it to increase power and mileage, programmer is a waste of money, everyone i've ever installed hurt mileage, no matter what the manufacture says. summit racing makes a good set of shorty headers for those trucks, they sure help out alot for 159bucks.

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    Senior Member Hullshot's Avatar
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    been thinking about the headers too. I heard programmers were a big waste. Also my trans when on the frewway very, very seldomly locks up the converter completely? I have driven 2 wheel drives and four wheel drives and the converter locks up on them at freeway speeds? Anyone know what gives on mine, there is no engine light and Gm bought it back in 98 because of a trans sliping or shifting issue?

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