the new gt 500 motors

Discussion in '96-04 - 2V Specific' started by Mbachota97, Jul 30, 2007.

  1. Mbachota97

    Mbachota97 Member

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    Does anybody know how much the motors can handle? Do they handle the same or more than the 03-04 cobras? Eventually im looking to build a car to handle close to 1000 hp and im just curious if it can take
     
  2. tooslow

    tooslow Active Member

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    its an iron block 5.4l motor. all forged and capible of handling as much hp (or more) than a term can. they have a VERY long rod and stroke. so high RPM is not there friend. if you plan on revving it past its stock limit, even the forged rods are in an iffy situation. they can take lots of HP, but at the rod length high revs are dangerous territory.

    heads are the same as the FGT, and almost the same as '00 cobra R heads.

    building a 5.4l from scratch with non gt500 parts would be cheaper and get you to the same goal with forced induction.

    a new 5.4l block is about $550-600. used is about $200-300. its the top-end that'll cost you the most. 4v heads get very expensive.

    i wouldn't buy a "gt500" engine than modify it. that would be like throwing money in the toilet.
     
  3. Mbachota97

    Mbachota97 Member

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    what is the rev limiter set at? I didnt want to do anything to it just want to build around the motor to make around a 1000?
     
  4. tooslow

    tooslow Active Member

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    i believe 6k or 6,500.

    i wouldn't spin a 6.65" rod past 6,500rpm unless it was a billet rod. even though a forged h-beam can handle the hp duty, it can't handle the revs. a lot of stress over a long rod.

    but yes, the engine can handle that much HP.
     
  5. Shocker98GT

    Shocker98GT Active Member

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    If you're going to spend that much money on a buildup, you might as well start out with a Darton wet-sleeved aluminum block (4.6 block poked out to a 3.7" bore) and a stroker rotating assembly. Final displacement ends up being 324ci but they'll make a lot more power than a 5.4L simply due to the increased bore size unshrouding the valves. And they'll handle over 1000hp.
     
  6. 19mustang95

    19mustang95 Legend

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    for teh price you will pay for a GT500 motor, you can build your own 4.6 DOHC, or 5.4 SOHC for ALOT cheaper.
     
  7. tooslow

    tooslow Active Member

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    building a 5.4l is only a small amount of $$ more than a 4.6l of the same type.

    the 324ci build-up you discribed would cost double. short deck strokers have lots of reliability issues and longevity issues the 5.4l will not have. you are right about the shrouded valves though.