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  1. #1

    Default need help with engine swap

    i have a 2003 yukon xl 5.3L flex fuel and a 2003 sierra 5.3L now the question is can i put the flex fuel engine in the sierra if so what else do i have to change the fuel pump is what i thought and i want to beef up the cam if i can i will be rebuilding the engine before the install please any help will be useful. thanks

  2. #2
    murdog94's Avatar
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    Feb 2008
    Cloquet, Minnesota, United States
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    If you arent trying to keep it E85, then you dont need to do anything other than bolt in the new motor. If you want it to stay a flex fuel motor then you need to swap over the entire fuel system (pump/tank/lines) since ethanol is corrosive to the normal fuel parts in a truck.


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  3. #3


    thanks mike what about beefing up the cam do i need better lifters and springs i am just a entry level tech with some college just want to get some views on it the truck the engine will be going in has headers and flowmasters

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