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big block vs.small block

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by mudddog91, Jul 16, 2001.

  1. mudddog91

    mudddog91 1/2 ton status

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    GOT A QUESTION,IVE GOT A FRESHLY BUILT 383 IN MY 74 AND LIKE THE POWER AND TORQUE BUT NOW I WANT MORE(THE BUG).WOULD I BE BETTER OFF WITH A STOCK 454 OR WITH MY BUILT 383?WHICH WOULD HAVE BETTER POWER AND TORQUE? I NEED A COMPARISON BEFORE I GET SET TO SPEND A SHITLOAD MORE MONEY!!!!!!!!!!!!!!!!!
     
  2. HarryH3

    HarryH3 1 ton status Author

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    The 454 will make more torque down low. A stocker peaks out the torque curve down around 1,600-1,700 RPM. You just have to be careful what year engine you get. Some "stock" 454's were much healthier than others. Start adding goodies and the 454 will make power that small blocks only dream about. [​IMG]

    <font color=black>HarryH3 - '75 K5</font color=black>
    <a target="_blank" href=http://www.angelfire.com/super/ThunderTruck>www.angelfire.com/super/ThunderTruck</a>
    It's a great day to be alive...
     
  3. rocko

    rocko 1/2 ton status

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    What are good ad-on's for the 454 to give it more juice?
    The 454 in my 76 Blazer.. seem's to have ALOT of low end power.. that baby can spin the rear tire's off the rim's right now.. and it need's a tune up.. [​IMG]..
    What's the correct carb to put on the 454? The only mod done to mine are header's ...

    A well armed society is a polite society.UPDATED <a target="_blank" href=http://www.rocko.rockcrawler.com>www.rocko.rockcrawler.com</a>
     
  4. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

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    Here is a picture of motivation, in favor fo the BIG BLOCK of course:
    http://24.10.209.54/bigolk5.htm [​IMG]
     
  5. BlazerGuy

    BlazerGuy 3/4 ton status

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    HarryH3 is right about which vehicle you get the "stocker" from. For example, a mint LS6 454 out of a 1970 Chevelle SS would make around 500 HP and 450 lb ft. [​IMG]

    <a target="_blank" href=http://www.K5.rockcrawler.com>www.K5.rockcrawler.com</a>
    *<font color=red>under construction</font color=red>*
     
  6. Stephen

    Stephen 1/2 ton status Moderator Vendor

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    With a fresh 383 in the truck, I'd look to some other area of the truck to improve it's performance. Power isn't everything. It's fun, but not as fun as, for example a winch when you're really stuck, or a better suspension when you're at the end of a long day of being beat up on the trail. You may be able to improve the motor you have also, for cheaper than a new motor.

    I don't know how you're already set up, or how you use the truck, but it's something to think about. The next $2K could go a long way somewhere else too.

    to answer your question, a stock 454 (depends a little on type) is going to FEEL way more powerful than the small block because it's going to make low end torque that creates the seat of the pants WOW factor. HP wise, the 383 may outrun it, but when you stand on it at a light, you should leave much faster.

    Making the world better, one truck at a time.
    SW-ORD
     
  7. white_knight

    white_knight 1/2 ton status

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    The 454 will give you that low end torque. It's great.I'm very happy with it.
    Changing cam will make a difference. A steve said , look at the whole set up on your truck- lockers?,tire size etc.
    That 383 might be enough for your truck.

    This is my 454
    <a target="_blank" href=http://a1028.g.akamai.net/6/1028/427/d5c6e6e1e0ee6b/whiteknight.scriptmania.com/images/9.jpg>http://a1028.g.akamai.net/6/1028/427/d5c6e6e1e0ee6b/whiteknight.scriptmania.com/images/9.jpg</a>

    This is what we've done to our 454
    t555 lift cam, speedpro forged pistons, rollers lifters, heads ported & polished, aluminum lift rise intake, cromoly rings, blueprinted and balanced.




    <a target="_blank" href=http://www.whiteknight.scriptmania.com/>http://www.whiteknight.scriptma
    nia.com
    </a>
     
  8. thatK30guy

    thatK30guy 1 ton status Premium Member

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    VERY NICE!!! [​IMG]

    I love looking at ANY big block chevy!!! Those motors are just awesome when built right!!! [​IMG]

    Anybody planning on checking out my homepage, forget it, I am still working on it!!!
     
  9. mudddog91

    mudddog91 1/2 ton status

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    Ive got 9" lift going to run 40" or bigger tires 14bolt and d44 8 lug 4.10: gears sm465/205,so i still wonder,will the 383 have enough torque to really move this truck or should i find me a 454 and quit worrying about it?
     
  10. 84_Chevy_K10

    84_Chevy_K10 Banned

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    No. Get a big block Two friends of mine have the same setup with 44s and they could both really welcome big block power. Another friend of mine has a truck with 39.5s and a 454.....that thing's insane.

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     
  11. white_knight

    white_knight 1/2 ton status

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    If you're going to go bigger you will need that big block.
    A friend of mine had a 350 with 44's, it just didn't have it to turn those tires.

    Big block is the way to go.



    <a target="_blank" href=http://www.whiteknight.scriptmania.com/>http://www.whiteknight.scriptma
    nia.com
    </a>
     
  12. RaisedK5

    RaisedK5 1/2 ton status

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    For 40s i'd be running a lower gear set, i have 36s on 4.10s and i think its lacking, you might try going 4.56 or 4.88, if not 5.13.

    Leland aka RaisedK5

    "Of all the things I've lost, I think I miss my mind the most!"
    "Are the voices in my head bothering you?
     
  13. shaneopie

    shaneopie 1/2 ton status

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    i think you should stick with the 383 and buy something else for the truck. you can build 2 small blocks for what it would cost to build one big block. and quit your whinning. you have a bad motor now.
     
  14. desertrat67

    desertrat67 Hawk Driver

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    Actually, if you have a stock bb and a stock sb you can put the same amount of money into them and the bb will make a lot more power than you could even dream of pulling out of a sb.
     
  15. shaneopie

    shaneopie 1/2 ton status

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    OH OK! I was just saying about if you build one up with high performance parts. Have you ever priced bb vs, sm parts in summit or jeggs. BB is way more pricey than sb.
     
  16. MRBIGBLOCK

    MRBIGBLOCK 1/2 ton status

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    i dont care what ya argue but there is no replacement for cubic inches!!!!!!!!!!!!!!!!!! and yes bigblocks do rule!
     
  17. Stephen

    Stephen 1/2 ton status Moderator Vendor

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    Knowing a little more about the truck now, I'd highly recommend saving the money you would spend on the motor and get a D60 for the front. Your 383 has more than enough torque to break the frontend at your will. And it will happen if you use it hard. Past that, gearing would be my next thing to look at. We've run with some big trucks running small blocks and with proper gearing, they can get around really well. It's still not the same as a big block, and I'm not trying to talk you out of it because I went with the big cubes for all the same reasons that you should. But there are other places for you to spend the bucks first that will get you much farther along the trails.

    You may ask my idea of proper gearing and my answer is of course going to be whatever you want in the diffs and a Doubler. Then you're set for just about anything from rock crawling to slingin' goo. Anything from 4.10's to 5.13's will serve you well with a 4:1 t-case gear available.

    Making the world better, one truck at a time.
    SW-ORD
     
  18. Blazer79

    Blazer79 1/2 ton status

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    Now that is a wise post. You should listen to this man. First fix the weak parts and then start thinking about a big block. Too bad I'm not following that advice myself. I'm dropping my 454 as soon as parts arrive from Summitracing. All I have is a 10bolt front and a 12 bolt rear. I'm still with 31" (actually 29") tires, though. I'll worry about the axles when I go with 35" tires (and have the money too).

    <font color=purple>//////
    <a target="_blank" href=http://blazer79.freeyellow.com>blazer79.freeyellow.com</a></font color=purple><font color=black>
    Soon a 454 K5!!</font color=black>
    [​IMG]
     
  19. white_knight

    white_knight 1/2 ton status

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    Next time, I should read more carefully.
    I didn't notice you mentioned a Dana 44.
    Stephen has good advise. I would definately upgrade there before the engine

    <a target="_blank" href=http://www.whiteknight.scriptmania.com/>http://www.whiteknight.scriptma
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  20. shaneopie

    shaneopie 1/2 ton status

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    well i will have to agree with you there. that there is no replacing cubes. i was just trying to give this guy that has spent alot of money making a small block stroked out some advice. I am not trying to get a small block and a big blovk battle going here. Big blocks are the s#&t!
     

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