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454 '85 Quick Question

Discussion in 'The Garage' started by AZ_Overdrive, Jun 1, 2006.

  1. AZ_Overdrive

    AZ_Overdrive 1/2 ton status

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    Is there a difference in the block between an 85 and an 89 454? I know about the TBI in 87, just wondering if I get an 85 block I can adapt it to all the FI stuff of an 89.

    Thanks for any info.
     
  2. shockline

    shockline Registered Member

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    you need to check the block casting numbers some are Gen 4, 5, and 6; different Gen's have different needs.
     
  3. b454rat

    b454rat 1/2 ton status Premium Member

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    The motor that is in my 89 was identical to the motor that was in my old truck, the motor itself was an 81 or 82.
     
  4. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    IIRC all BBC's were gen IV from 1965-1990, starting in 1991 came the gen V and 1996 came the gen VI BBC.
     
  5. AZ_Overdrive

    AZ_Overdrive 1/2 ton status

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    Thanks for the info!
    Now on to getting ready for the swap!
     
  6. AZ_Overdrive

    AZ_Overdrive 1/2 ton status

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    Q for those who have done 350 -> 454 TBI Swap

    OK, the questions are going to start flowing now! (can't search for old posts so sorry for any repeats)

    Those that have completed the 350 to 454 TBI swap, How did you modify your exhaust to match up to the 454? I am talking about stock manifolds and stock Y pipe. Not going to use headers on the Burb.

    Thanks for any info!
     
  7. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    That's an easy one. Cut off the existing Y-pipe and drive or tow your rig to a muffler shop and have them make you a new Y-pipe and weld it up. :thumb:
     
  8. 1-ton

    1-ton 1/2 ton status Premium Member

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    I have a question about this. If a 1991 square bodied V-series truck had a BB 454 TBI, would it have been a Gen IV or a Gen V engine? Also, which Generation BB first came with Vortec Heads?
     
  9. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    1991 should be a gen V engine and the first vortec should be a gen VI engine starting in 1996.
     
  10. 1-ton

    1-ton 1/2 ton status Premium Member

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    What of the fact that all the V-series trucks came with a part #71140 ECM, which is the ECM used to control Gen IV BB 454 TBI engines.
     

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