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427 MOTOR

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by ftn96, Oct 24, 2001.

  1. ftn96

    ftn96 1/2 ton status

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    Does anyone know anything about these motors? I may have dib's on a stock one (complete) that runs but needs to be rebuilt. Can someone educate me on them as far as reliability, parts locating, price, etc etc etc. .. . . . .Oh yeah and power vs. weight.

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  2. zakk

    zakk 1/2 ton status

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    an aluminum tall block 427 was available on Yenko camaro's, but if that was what you had...[​IMG]
    I believe the following is true (as far as i know): 427 are available in both tall and short decks, short deck being more popular. parts are a bit pricey, but any BB is compared to a SB350. obviously a 454 would be the cheaped of the BB's to rebuild. i have never heard bad expereinces with them. If you can get it at a fair price it is worth it, IMHO. there is no replacement for displacement.

    -Zakk
    '77 K5 SB 400 TH350 NP203 p/t 6" Lift D60 14BFF 4.10's 36"Wrangler II's

    [​IMG] CK5's MOAB 2002 OR BUST!! [​IMG]
     
  3. Greg72

    Greg72 "Might As Well..." Staff Member Super Moderator

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    Do yourself a favor and get the block casting number from it. It's located on the drivers side near where the cylinder head meets the block....just about the most impossible area to see when the engine is installed [​IMG]

    My K5 came with a "427" when I bought it....I didn't know enough about it at the time, but I have since learned that it's not an 'original 427' like from some old musclecar. It's actually a 396 block (confirmed by those block casting numbers) that has been overbored .030", with a 454 crank.

    The "real" 427s were a 4.250" bore with a 3.76" stroke
    My "Quasi-427" is a 4.126" bore with a 4.00" stroke

    So in this case, I would bet that my additional stroke will give me a meatier torque curve, though I'll probably be limited on high-end RPMs vs. a true 427 which could probably spin a bit higher with that smaller stroke.

    Anyway, that's all I know about this so far.....but it's a lot more than I knew 7 months ago!!! [​IMG]

    -Greg72
     
  4. ftn96

    ftn96 1/2 ton status

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    I went to mortec.com and got a little bit of info. I saw that they came as aluminum blocks for a small number of years.
    Wouldn't an aluminum big block be ideal since I'd get the displacement of the big block and the weight of a small block if not less?
    And what are the pro's and cons of a tall deck and short deck?

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  5. Blazer1970

    Blazer1970 1/2 ton status

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    396 is the original Gen. IV big block Chevy.
    396 - 4.094b X 3.76s

    402 is a .030 overbored 396
    402 - 4.125b X 3.76s

    427 is a bored 396/402
    427 - 4.25b X 3.76s

    454 is a stroked 427
    454 - 4.25b X 4.00s

    502 is a bored 454
    502 - 4.447b X 4.00s

    The rod and main bearing diameters are the same for all of the above, so cranks will swap.

    Similar to small blocks, heads etc. are easy to swap between different displacements, so any Gen IV BBC is about the same cost to build (substantially more than a SB).

    As alluded to above, there is a tall deck truck version of the 427 (also in 366 cid). The tall deck motors are not desirable as builders because the intakes are wider, and the aftermarket stuff will not fit without spacers. The aluminum 427 ZL1 motor was not a tall deck motor.

    Tim

    70 Blazer CST 4X4 350 SM465 NP205
    87 Burb 4X4 350
    01 GMC 2500HD 4X4 Duramax/Allison
     
  6. dyeager535

    dyeager535 1 ton status Premium Member

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    Aluminum 427 block would be awesome, and GM has started making them again. Splayed 4 bolt mains, thicker sleeves, you name it, this block is built right. Price tag to match. Check www.dorianyeager.com/index2.html
    Why insist on counting when the ring gear has the tooth counts stamped in?
     
  7. Mr.Chevy4x4

    Mr.Chevy4x4 1/2 ton status

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    What are you talking about crappy vehicles????????? I own a new extended cab truck with the 5.3 and it will run circles around my '98 with the Vortec 350, plus it gets better gas mileage. I have 53K miles on it already and not a single problem! Can't say as much for my friends 2001 F250 powerstroke though, it has been in the shop numerous times with electrical problems. Just because something doesn't have a solid front axle doesn't make it "crap". Some people drive a lot of miles, like myself and prefer ride quality over lift ease and maybe some strength(which is debateable). This is a Chevy K5 board, most people here are Chevy fans, so don't come on here hacking Chevy products.

    '85 K5 : Run it til it breaks, then fix it and go again!
     
  8. ftn96

    ftn96 1/2 ton status

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    Can I moderate my own post?[​IMG]
    Ok, so how does this help me decide weather or not to get a 427 for the blazer?

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  9. dyeager535

    dyeager535 1 ton status Premium Member

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    Crappy vehicles? Ok, sure, we COULD talk IFS, which happens to NOT be what every K5 from 69-91 was, and which most everyone here has. Hmm. Solid Axle. Easier, cheaper to lift, stronger, better wheeling characteristics, need I go on? I don't even NEED those capabilities, I just know that solid front axle is better for ALL of that, and that is what a LOT of people on here use.

    But, I was being general. If you consider a FWD Impala, or a FWD Monte "SS" with a pathetic 3.8 (not even SC!) with the ugliest ass end since the 70's Ford Ranchero, not "crap", you are entitled to your opinion. Need I talk about Malibu's? How about Metro's? Like those? How about Cavaliers? Best interior I've ridden in lately! (yeah right) You consider killing your only Mustang competition a good idea?

    And your trucks! Ever seen an '88-up front grille peeling? Wow, plastic mylar tape on plastic grille. Thats a quality product. At least on the 73-87's they used stainless steel, so that 5 years after they were made, they didn't look like crap.

    The ONLY thing that GM is selling much of, that is even halfway decent, are the new trucks. The trucks look mean (I DO like the grilles, plastic or not) and the motors are great, and the trannies are much improved. Gm CAN do things right, but they fail to more often than not. Tease people with all these cool concept cars (El Camino comes to mind) and then not brind them to fruition. When GM tries to cram ugly design and mediocre performance on a population that DOESN'T WANT THAT, (if they did, GM would be #1 in sales) and doesn't listen to some of their previous die-hard customers and fans, then something is wrong. Don't even get me started on how they killed off Oldsmobile...

    Again, this could go on for ever, and we could get into a debate that could go on for days. Is GM number one for US auto sales for ANY of their vehicles? Any GM car or truck #1 in sales here?

    As a last comment, compare GM's ENTIRE lineup of vehicles (including engines and options availability) in 1968, versus 2002. Which lineup brings to mind excitement, and which one brings to mind "look like every other automobile out there"?

    Dorian
    My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>www.dorianyeager.com/index2.html</a>
    Why insist on counting when the ring gear has the tooth counts stamped in?
     
  10. ftn96

    ftn96 1/2 ton status

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    <blockquote><font class="small">In reply to:</font><hr>

    so don't come on here hacking Chevy products

    <hr></blockquote>
    Does this mean that Im a bad boy for "hacking" up my chevy blazer's front fenders? [​IMG]

    But still, what does all this have to do with my post about the 427?



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  11. dyeager535

    dyeager535 1 ton status Premium Member

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    I think its pretty much been covered: more expensive to rebuild than a 454, less CID, rarer, and you don't want the "tall deck" version, which apparently is quite common.

    Only thing to consider (to me) is acquisition cost. A "running core" 454 here is now $800, so $800 just to get the motor (and that was a '74 car smog motor too) and then a good $1200 for a "cheap" rebuild, gets expensive. If you can get a 427 for dirt cheap, and nothing is wrong, it would obviously be cheaper than a 454 that you had to pay through the nose, for just a core.

    Dorian
    My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>www.dorianyeager.com/index2.html</a>
    Why insist on counting when the ring gear has the tooth counts stamped in?
     
  12. 90blzr

    90blzr 1/2 ton status

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    [​IMG]LMAO[​IMG]!!!!
     
  13. 90blzr

    90blzr 1/2 ton status

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    You can also get MORE displacement and with an aluminum intake get the weight of a small block with a BIG BLOCK CADDY[​IMG]
    Sorry, I know that doesnt have anything to do with the 427 in your Blazer[​IMG][​IMG]
     
  14. J.R.

    J.R. Guest

    as far as swaping parts 396 and 427 are internal bal., and 454 are external balanced. the 427 are a very good motor, they have excellent mid and upper range power. if you want a lot of low end power go with the 454. with cost rebuilding a 427 to a 454 is a matter of very little pocket change.

    BIG BLOCK MAN
    "MORE POWER"!!
     
  15. CrazeeBush

    CrazeeBush 1/2 ton status

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    B, did you see that? he's hackin on my Monte! lol BTW, where do you come up with this [censored]? And last time we spoke, you just wanted a mild 350, lol You said you weren't gettin stupid till that camaro comes along.. The fever already caught ya? I bet those new 36" tires are gettin small, eh? hehe

    -BuSH
    '83 K5 Blazer
    '98 Monte Carlo z34
     
  16. dyeager535

    dyeager535 1 ton status Premium Member

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    BTW, I apologize for helping get off topic there. Do you know yet if its a tall deck block or not?


    Dorian
    My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>www.dorianyeager.com/index2.html</a>
    Why insist on counting when the ring gear has the tooth counts stamped in?
     
  17. ftn96

    ftn96 1/2 ton status

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    Nah, no fevers yet, and the 36's are still big to me.
    But if the 427 was gonna come my way cheap, I might be interested in looking into it.
    LOL!!!, wouldn't take much to hack up that monte. Its all plastic. The saws-all would eat that biotch for breakfast, spit it out and eat it again for lunch.
    I can get a 350, never rebuilt for free. I'll probably go that route. Then take my current and build the 383 for the future Camaro.[​IMG]

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  18. ftn96

    ftn96 1/2 ton status

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    Anh, a friend said he had a possible lead on this complete motor for dirt cheap. that is all the info I know.

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  19. ftn96

    ftn96 1/2 ton status

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    PS, no need to apologize. I was just taking the oportunity to poke you guys in the ribs while you had your arms and fists raised in all that excitement. [​IMG]

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  20. CrazeeBush

    CrazeeBush 1/2 ton status

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    I'm still pissed about the Monte comment. Mine's not the new fugly body style, but it's got the 3.8L motor. It's only rated @ 200hp and 225 ft/lbs of torque, but it's enough to pull down 25mpg city/30+ highway and still move fast enough for me. The S/C versions of these motors are in the GTP's, and they only add 40hp, but the aftermarket for them is WAY better. There's a company that makes intercoolers, smaller pulleys, etc etc and they have a 500hp GTP that is bad ass! Too bad it would cost a fortune to replicate though.. Oh Well, enough on that.... I tell ya B, you outta go as big as possible with that motor and be done with it...


    -BuSH
    '83 K5 Blazer
    '98 Monte Carlo z34
     

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