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gen differences in the 454

Discussion in 'The Garage' started by big_truxx, Jan 9, 2005.

  1. big_truxx

    big_truxx 1/2 ton status

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    i never really was told what the differences are in the different gen 454. what are the years for the different gens? other differences?
     
  2. sweetk30

    sweetk30 professional hooker Premium Member

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    gen info

    gen 1 was 65-90 gen 2 was 91-present and gen3 96-up
    the gen2 and gen 3 are vary close but 3 fixed lots of the short comings of the 2 seires. best to buy a book and read up lots of info in them got both of mine at b.n for less than 20.00 :cool1:
     
  3. big_truxx

    big_truxx 1/2 ton status

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    very cool! thanks :waytogo: people were talking about gen 4,5&6 on another post and i realized i didnt know what they were really talking about. i know more now though. so what would a gen 4,5 or 6 be?
     
  4. sweetk30

    sweetk30 professional hooker Premium Member

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    sorry for the mixup

    gen 4 is the first series, gen5 is the secend series, and gen6 is the 3rd series.:D
     
  5. big_truxx

    big_truxx 1/2 ton status

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    :rotfl: :rotfl: it now suddenly makes sense. :whistle: thanks. i now know whats going on AND have been able to laugh at myself today :grin:
     
  6. thor

    thor 1/2 ton status

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    Gen 5 changed to a one piece rear main seal, water passages changed some in the deck, gen 5 heads had non adjustable valvetrain, and the lip the timing cover seals to the pan moved to the back side like a small block. Also blind head bolt holes

    Gen 6 had the gen 5 changes above, plus changed to a roller cam with taller lifter bosses, a 6 bolt timing cover, the fuel pump boss dissapeared, the in-block oil passages were moved from the pan rail to along the cam, they also have a completly different oil filter pad and bypass.

    edit: The oiling system difference (priority main oiling), and the fuel pump boss actually changed on the gen 5
     
    Last edited: Jan 12, 2005
  7. 1-ton

    1-ton 1/2 ton status Premium Member

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    I did not know this! Does this mean they came with rocker shafts, as oppossed to rocker arms riding on a rocker arm stud?
     
  8. big_truxx

    big_truxx 1/2 ton status

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    oh i see. that all is interesting info. i have a gen 4 currently and most likely will stick to them. i like the older stuff :waytogo:
     
  9. thor

    thor 1/2 ton status

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    No they are still mouted similar, but I believe they have a shouldered bolt, vice a stud... They do make a kit to retrofit studs on them but the threads are smaller. Don't know, but assume they could be drilled and tapped for an earlier style stud..

    I built a 540 out of a gen 6 502 block, I have never personally worked on a gen 5 or 6 head though as I used a set of darts. I'm sure there are differences I don't know, these are just the ones I found. If I was to do the big motor over again I would use a merlin block
     
  10. 1-ton

    1-ton 1/2 ton status Premium Member

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    The last Big Block I built was back in the 80's when the Gen IV's where still the latest model of Big Block. I would never want an engine that did not have adjustable valves; just like I do not want my Small Blocks to have the pressed in type studs. I always modifeid my Small Block heads for screw in type rocker studs.
     

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