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Thread: Is a Olds 455v8 worth building?

  1. #1
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    Default Is a Olds 455v8 worth building?

    Kinda thinking about putting it in the Blazer when I get it if its worth building.

    If I can buy it for $300-400 including a turbo400 trans would it be a good buy? As long as its moving freely and has all the parts on it?

    Please just answer the questions and not roast me on specifics of mot having anything yet.
    10 Kia Forte EX (Wifes) 145k miles

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  2. #2
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    Default Re: Is a Olds 455v8 worth building?

    The heads on a 455 are awful. Find someone to port them for you. That will help quite a bit. Then the same as any engine.. Find you a cam and intake. Remember not only is it a big block, the 455 doesn't like to rev high. 5500 is tops.
    - I break things -
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  3. #3
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    Default Re: Is a Olds 455v8 worth building?

    These block are worth picking up if they are not junk. Lots of torque and plenty of aftermarket parts are available. BOP Th 400 is worth the $400 by itself.
    Adam K
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  4. #4
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    Default Re: Is a Olds 455v8 worth building?

    They've had it for sale $600obo for about a month now.

    They sent me pics but can't get them to save to my tab and cant get to the comp. to try right now.

    But they said its a 1974 with 70-80k miles on it. Complete motor and trans. They aren't sure when it ran last though, they bought it to put in a car and then ended up not getting the car
    10 Kia Forte EX (Wifes) 145k miles

    12 Chevy Sonic LTZ HB Turbo (My DD) 102k miles

    95 Chevy 1500 Ext cab 4x4 (my spare and toy) 240k miles, now with a 1999 5.3 and 4L60e with 191k miles.

  5. #5
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    Default Re: Is a Olds 455v8 worth building?

    - I break things -
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  6. #6
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    Default Re: Is a Olds 455v8 worth building?

    This one is a 74, yeah I know it's not a huge HP motor but it does have some nice torque. I figure that and new gears could move the Blazer pretty easily.

    Olds 455.jpgOlds 455 2.jpgOlds 455 3.jpgOlds 455 4.jpg

    Does it look desent from the pics? Is it worth the $300-400 I'm willing to pay?
    10 Kia Forte EX (Wifes) 145k miles

    12 Chevy Sonic LTZ HB Turbo (My DD) 102k miles

    95 Chevy 1500 Ext cab 4x4 (my spare and toy) 240k miles, now with a 1999 5.3 and 4L60e with 191k miles.

  7. #7
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    Default Re: Is a Olds 455v8 worth building?

    A pic of an engine is like a cover of a book.

    It's def worth 400 though.
    - I break things -
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  8. #8
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    Default Re: Is a Olds 455v8 worth building?

    yeah i know you cant tell much from just looking at a pic or two, I figure I'd check it out with my brother-in-law and if they take my offer great. if it runs, even better. If it doesn't I could get most of my money back scrapping it with some other junk.
    10 Kia Forte EX (Wifes) 145k miles

    12 Chevy Sonic LTZ HB Turbo (My DD) 102k miles

    95 Chevy 1500 Ext cab 4x4 (my spare and toy) 240k miles, now with a 1999 5.3 and 4L60e with 191k miles.

  9. #9
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    Default Re: Is a Olds 455v8 worth building?

    Check both dipsticks (oil and tranny) for any glimmer of metal. Thats one of the main things I always do when im looking at a motor. Make sure if you go look at it take some tools to put on the crank to make sure it turns freely, Sometimes you cant get it with just your hand.

    Notice the end of the transmission has a bag over it and taped up to keep dirt out. That shows that most likely its good and they at least kept water from getting in it.
    Also looks like a newer cap and wires.

    Show some cash in there face once you check it out and i bet they will take that 3-400.
    1973 Dodge Dart Swinger: Garage Queen
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  10. #10
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    Default Re: Is a Olds 455v8 worth building?

    Yeah, depends on what I can get the Blazer for. If I can get it for $1200 and the motor/tranny for $300 I'll be at my $1500 allowance for now. Either I get the motor or some used tires. LOL but if I get the motor I'll be needing NEW tires
    10 Kia Forte EX (Wifes) 145k miles

    12 Chevy Sonic LTZ HB Turbo (My DD) 102k miles

    95 Chevy 1500 Ext cab 4x4 (my spare and toy) 240k miles, now with a 1999 5.3 and 4L60e with 191k miles.

  11. #11
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    Default Re: Is a Olds 455v8 worth building?

    I'd buy tires
    - I break things -
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  12. #12
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    Default Re: Is a Olds 455v8 worth building?

    Oldsmobile engine are good they make good torque the 74 had f casting heads worse flowing off the 455 but can make good power with some port work for the cost of building it and making it fit in a chevy blazer it would be cheaper to build a 350 or 383 sbc
    JPrice

  13. #13
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    Default Re: Is a Olds 455v8 worth building?

    dont forget to put the title and plates into your budget also. I would say get the blazer, get title done, and get a set of tires. Drive it for a while and then plan on a motor swap later once you save up some. That way it will give you time to build the motor also before you put it in that way you have a extremely fun ride.


    It sure would be sweet with that 455 but also you have to worry about the drive shafts and everything fitting correctly. I dont know if blazers have divorced transfer cases or not, but if they dont you would probably have to find a transmission to bolt up to the motor. The list goes on and on of different parts. Im not trying to discourage it because I think it would be awesome to do. Just gotta look at the big picture of what all you are gonna need.
    1973 Dodge Dart Swinger: Garage Queen
    1984 Dodge Ramcharger: Project postponed
    2015 Dodge Dart: 2.slow 6 speed manual No mods.... Yet


  14. #14
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    Default Re: Is a Olds 455v8 worth building?

    J heads are the worst. That being said I have spun my 455 to 7k on occasion and always cranked it out to 6.5k. Great torque and midrange.
    repair and detailing, amsoil dealer304-677-5804www.sbfilters.com

  15. #15
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    Default Re: Is a Olds 455v8 worth building?

    Yeah I know about registering and plates, did not think about the driveshaft and those things. I thought it should fit with the right mounts since some came with a 400V8 but I don't know much lol

    Like I said it was just a thought, deff. will buy the Blazer and drive it as-is and fix it along the way till I can afford a good rebuild or swap
    10 Kia Forte EX (Wifes) 145k miles

    12 Chevy Sonic LTZ HB Turbo (My DD) 102k miles

    95 Chevy 1500 Ext cab 4x4 (my spare and toy) 240k miles, now with a 1999 5.3 and 4L60e with 191k miles.

  16. #16
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    Default Re: Is a Olds 455v8 worth building?

    Quote Originally Posted by 99trackerconv View Post
    Yeah I know about registering and plates, did not think about the driveshaft and those things. I thought it should fit with the right mounts since some came with a 400V8 but I don't know much lol

    Like I said it was just a thought, deff. will buy the Blazer and drive it as-is and fix it along the way till I can afford a good rebuild or swap
    GM 400 is a small block.
    - I break things -
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  17. #17
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    Default Re: Is a Olds 455v8 worth building?

    Really? See I dont know much. Thats why I ask.
    10 Kia Forte EX (Wifes) 145k miles

    12 Chevy Sonic LTZ HB Turbo (My DD) 102k miles

    95 Chevy 1500 Ext cab 4x4 (my spare and toy) 240k miles, now with a 1999 5.3 and 4L60e with 191k miles.

  18. #18
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    Default Re: Is a Olds 455v8 worth building?

    The 400 can be one wicked tq monster.
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  19. #19
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    Default Re: Is a Olds 455v8 worth building?

    Get tires, it has an engine...

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  20. #20
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    Default Re: Is a Olds 455v8 worth building?

    Yes sir! lol thats what I was thinking.

    Looked at it better today, didn't drive it though cause it wouldnt start and we wore the battery down.
    Its going to need dr. side floorpan ($40) and rear pass. side floor corner ($120 for complete side) and not sure about the cargo area cause I didnt open the tailgate.
    So I know I won't go over the $1200 now.
    10 Kia Forte EX (Wifes) 145k miles

    12 Chevy Sonic LTZ HB Turbo (My DD) 102k miles

    95 Chevy 1500 Ext cab 4x4 (my spare and toy) 240k miles, now with a 1999 5.3 and 4L60e with 191k miles.

  21. #21
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    Default Re: Is a Olds 455v8 worth building?

    Ok, so it looks like it needs a passenger side rocker. It needs floorboards put in, it needs paint, and interior. It's a 305 and it needs tires.
    I think I'd pass.
    - I break things -
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  22. #22
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    Default Is a Olds 455v8 worth building?

    Yeah who knows what other rust is hidden. Did you crawl under it an look at the frame rails?

  23. #23
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    Default Re: Is a Olds 455v8 worth building?

    It sounds like i would pass too. As far as the engine and trans, if nothing is wrong with the transmission, you could make money on it.

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  24. #24
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    Default Re: Is a Olds 455v8 worth building?

    Ok, went to drive it. Runs good and shifts good too. Got to talk to the owner in person too. Said the last owner replaced the fenders and inner fender wells, the rocker panels and rear wheel panels and primered it. The interior is in great shape except the driveres seat bottom has some tears.

    So what I would need is the driverside floorpan, passinger side rear corner and then its just small pieces IF I want to fix them. And a new set of tires. Oh and a really good cleaning everywear. And I think I'm going to plastidip the whole thing.

    I told him I'll tell the bank and get back with him. (not going through the bank, just told him that) He said ok and then said he'd let it go for what he's got in it. $1050 is what both my brother-in-law and nephew heard. I'm not so sure though.
    10 Kia Forte EX (Wifes) 145k miles

    12 Chevy Sonic LTZ HB Turbo (My DD) 102k miles

    95 Chevy 1500 Ext cab 4x4 (my spare and toy) 240k miles, now with a 1999 5.3 and 4L60e with 191k miles.

  25. #25
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    Default Re: Is a Olds 455v8 worth building?

    Basically what I just read was "it was a rolling junkpile rusted to hell and now it's full of bondo".
    - I break things -
    '70 Mach-1 "money pit"

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