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  1. #1

    Default 2007 silverado and flex fuel eng.

    well i found a 2007 1500 ltz silverado 5.3 liter with low miles, the only problem it has the flex fuel eng, which im not fussy about. i think they have the alumminum block so how will it stand up to a few hundred thousand miles. here the ethanol gas mileage is poor. now when you run the unleaded fuel are you going to run into problems later? anyone have this eng. can yo share any info with me ..whats your take on the flex fuel engs. thanks

  2. #2


    i have that truck but im nowere near 100 thousand miles but no problems yet

  3. #3
    Master Mechanic TahoeFever's Avatar
    Join Date
    Sep 2007
    Now IN Auburn AL :)


    i got the 5.3 flex and I love that engine's almost trouble free ..i say almost cause you still gotta change the oil spark plugs etc etc just turning 61k right now ... she's a solid engine
    04 Tahoe LT 5.3L stock MSD 8.5mm Wires
    Gigbson Duels Straight Exhaust, Parrot 3100 Bluetooth
    K&N 77 Series CAI, Sirius Radio
    De-badged, Valet Dei remote start
    5000k HID
    Federal 100watt air horn

  4. #4

    Default 2007 silverado and flex fuel eng.

    thank for the reply guys... are any of you where they have extreme cold winter conditions as just wondering how the alumimum blocks will hold up to cold weather

  5. #5


    right now in houston its about 30 degrees and they hold up pretty good

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