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4.3L V6 Vortec 04 Astro Van long block fit in a 97 GMC?

Discussion in 'Chevy Astro Forum (GMC Safari)' started by ChrisZ, Aug 11, 2009.

  1. ChrisZ

    ChrisZ New Member

    Hi,
    I have a '97 GMC Sierra Pickup with a 4.3L V6 Votrec engine. I spun the rod bearings and found a 4.3L V6 Votrec out of an '04 Astro Van. My neighbors installed it for me. The engines looked almost the same. we had to change a few things, like keeping the aluminum intake manifold from the 97 GMC, and we had to drill and tap a knocking sensor hole in the block to fit the origional sensor. But I think it's gone pretty smoothly. It's in now, and begins to turn over but wont start. I talked to a second mechanic yesterday and he says the 04 Astro Van engine will never work in my '97 GMC! that's the first I heard of that. I REALLY hope thats not true. Can someone help me out with this?
    Is there a year range of vortec engines that are compatible with only certain years?
    Thanks, Chris from Oklahoma.
  2. Z07

    Z07 New Member

    "Never" is just wrong. People put LSX engines made today into cars that were made pre-WWII so you know that with the right effort and expense it can be done. Maybe the mechanic meant it's impractical?

    So the engine turns over with the starter but won't start?

    Which of these are you missing now? Fuel or Spark?

    Check fuel with a pressure gauge on the fuel rail and a noid light for injector pulse. Check for spark with a spark test tool.
  3. ChrisZ

    ChrisZ New Member

    Reply to Z07

    Thanks, yeah it sounds like the starter is trying and it just wont turn over.
    I'm not sure if it's missing spark or fuel. I'll ask after work today. ( My neighbors are the mechanics working on the truck, I just watch and try and learn )

    I'll try what you suggested.

    I've been looking around online, and keep finding things (for other years, not mine) that tell which engines are compatible with that particular truck. however I haven't found this for mine yet.

    Does anyone know off hand, What is the swapable enigne range for the 4.3L V6 Vortec 97 GMC Serria?

    Thanks for the quick responce.
  4. retired2001

    retired2001 New Member 1000 Posts 100 Posts

    I've never heard of anything that would keep you from using the newer engine. Hope it works out for you, good luck!
  5. ChevyFan

    ChevyFan Administrator Staff Member 1000 Posts

    Good post, it's just a matter of time and effort if it can get done or not. :)

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