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2007 5.3 in Aluminum or Cast Iron

This is a discussion on 2007 5.3 in Aluminum or Cast Iron within the GM Trucks forums, part of the Vehicle Specific category; I'm in the market for a new pickup. Either GMC or Chevy. I see them on the lots with both. ...

  1. #1
    Junior Member AtLarge's Avatar
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    Bright Metallic Blue A4
    1999 WS9

    Question 2007 5.3 in Aluminum or Cast Iron

    I'm in the market for a new pickup. Either GMC or Chevy. I see them on the lots with both. Which engine block would you get and why?

  2. #2
    Member jimmy77611's Avatar
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    2000 Z28

    I would get the aluminum because of the weight reduction. You'd probably get a slight more fuel economy because of it.

  3. #3
    old timer blue02Z's Avatar
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    Navy Blue Metallic
    2002 Z28

    aluminum. got with the chevy. not the Generic Made Chevy

  4. #4
    Member drewhenderson13's Avatar
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    Dark Blue
    2000 S-10

    cast iron... more durable. aluminum sucks

    and if u ever want to modify it cast iron will hold up a lot better.

    only real advantage of aluminum is it disipates heat faster. but at the same time it cracks because of overheating at a lower temp. (thats where the durability sucks).

    weight difference isnt enough to matter, i doubt u would get any gas mielage difference at all.

  5. #5
    Senior Member BLKCLOUD's Avatar
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    B2300 (Fluffy) Retired
    Plain-Jane Dodge Truck

    Aluminum. Lighter, dissipates heat better, plenty strong. There is no reason - at all - to insist on an iron block in something like this.

  6. #6
    Senior Member SeVeReDiStOrTiOn's Avatar
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    05 Wrangler
    00 Z28 sold :-(

    Iron...yea it's heavier but your truck is already going to be heavy so who gives a shit about 90lbs. Trucks are all about durability....iron is stronger hands down.

  7. #7
    MOTOR CITY MARO' SSTODD's Avatar
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    PEWTER
    2000 CAMARO SS #3821

    Go with the E-85 capable engine because you get bigger fuel pump and injectors for future upgrades like a blower.

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