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  1. #1

    Default help needed: performance improvements to the 4.3l V6

    Has anyone here done some successful mods to the 4.3l V6 to improve its performance and gas mileage?

    I just purchased a 2004 Silverado 1500, short box regular cab. It's a very clean low mileage (50k) truck with a 5-speed manual trans and a 3.42 rear axle ratio. Driving over 500 miles at 65-70mph on the highway netted me a whopping 18mpg. I was expecting more. Plus, this engine seems a bit weak and like all good Chevy engines I'm sure it has some potential.

    The truck is all stock with the exception of a dual muffler system that splits just behind the single stock catalytic converter.

    I'd like to hear from some of you what you have done to improve this engine in terms of both performance and gas mileage. I'm not afraid to toss a cam in it either, if needed, or to rework the stock heads. I'm not looking to turn this thing into a fire breathing street truck, but I am sure that it can be improved upon in some key areas from where it is now.

    And for those who want to post and tell me to just drop in a v-8......that mod is beyond my time availabilty, pocketbook and needs.


  2. #2
    Legend s5belford's Avatar
    Join Date
    Apr 2009
    Kalamazoo Michigan


    what ever you can do to lose weight should help.

    I had a jimmy with the 4.3 and got the the sides from the trim down all the way around rhino lined to help prevent rust just added a TON of weight DESTROYING my gas mileage and burning through breaks.

    I also put the brush guard and nurf bars not realizing how much more weight it all added so I took the brush guard and nurf bars off which immediately gave me 2 mpg's back but I regreted the rhino lined sides as I was pulling it out of the parking lot.

    I guess my only suggestions would be maybe a K&N air filter and a tonneau cover. Hope this helps.


    2009 Silverado LT1: All Star Edition
    5.3 Liter V8 4x4

    Locking Rear Differential
    3.73 Rear Axle
    Fog Lamps
    Factory Remote Start
    Locking Tailgate
    20" Wheels

    Rear Wheel House Liners
    Molded Mud Flaps
    Stainless Nurf Bars
    Driver Information Center
    20% Tinted Windows
    Low Profile Diamond Plate Tool Box
    GM Bed Liner
    Silver Birch Metallic Mirror Covers
    Silver Birch Metallic Vent Visors
    Flowmaster Super 40 (knock off)
    20" Wheels
    Bed Rail Protectors
    Extang Tonneau Cover

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