Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

IS a 427 B.B. swap in an 87 Easy to do or not worth it?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 87superblaze, Feb 6, 2002.

  1. 87superblaze

    87superblaze 1/2 ton status

    Joined:
    Mar 12, 2001
    Posts:
    104
    Likes Received:
    0
    Location:
    Upper Michigan
    I can pick up a 427 Big Block for $300. What are some problems I might run into when swaping out the TBI 350. Should I just stick with the 350? Does the 700R4 bolt up to the Big Block?

    Don't worry about my running gear, it's very capable of handling Big Block power. I just want to know if it is worth the trouble?

    PLEASE REPLY IF YOU KNOW ANYTHING ABOUT SWAPPING IN BIGGER ENGINES?

    THANK YOU!!!

    My Truck <a target="_blank" href=http://www.community.webshots.com/user/nicksm79>http://www.community.webshots.com/user/nicksm79</a>
     
  2. k30gambi

    k30gambi 1/2 ton status

    Joined:
    Dec 24, 2001
    Posts:
    108
    Likes Received:
    0
    Location:
    illinois
    i don't know much but maybe this will spawn more responses for ya. my '82 had a 350 originally we had to find different motor mounts, a bigger radiator and i think we went with a bigger (12in) clutch (sm465 trans). the bellhousing of the trans bolted right up to the 454. the 700r4 should bolt right up to the 427. i imagine its not hard to get rid of the TBI, my in-law took the tbi off his 87 350, changed the heads and went with a carburetor. we also had to find some brackest for the accesories.
     
  3. juanblzer

    juanblzer 1/2 ton status

    Joined:
    Sep 12, 2001
    Posts:
    1,614
    Likes Received:
    9
    Location:
    Chandler, Arizona
    i would love to have that TBI if you want to part with it.
    Juan

    chrome sucks
    about chrome: "I didn't know it was possible for something to both suck and blow"
     
  4. 87superblaze

    87superblaze 1/2 ton status

    Joined:
    Mar 12, 2001
    Posts:
    104
    Likes Received:
    0
    Location:
    Upper Michigan
    I'll let you know if I do.

    That mean you'll have to convince me to swap in the 427!! LOL!

    My Truck <a target="_blank" href=http://www.community.webshots.com/user/nicksm79>http://www.community.webshots.com/user/nicksm79</a>
     
  5. wrath

    wrath 1/2 ton status

    Joined:
    Mar 4, 2001
    Posts:
    182
    Likes Received:
    0
    Location:
    Grayling,Michigan
    I've dropped a 454 in my 86K5 a couple years ago and the 4 core radiator gave me the most problems getting it to fit and getting the mounts to hold it..What I ended up doing was running that steel strapping (stuff with the holes)around core support and radiator and lined up holes and thru a bolt in it on grille side..where hood meets support at latch I formed the strap to support and ran a couple self taps into it..other then that I did yank all the heater box and ac out and cover hole with older model steel cover&amp; fan out of a 79..that gave more room on pass side..I was running sm465/205 so cant help with the trans. Do the BB swap and make it fit..you wont regret it.

    70K5 350ci.350/205 "PROJECT 40"BOGGERS" It runs and its clean !!
    <a target="_blank" href=http://communities.msn.com/OurMudToys/the70k5blazer.msnw>http://communities.msn.com/OurMudToys/the70k5blazer.msnw</a>
     
  6. Leadfoot

    Leadfoot 1/2 ton status Premium Member

    Joined:
    Nov 28, 2000
    Posts:
    3,112
    Likes Received:
    1
    Location:
    Western Massachusetts
    It will "bolt right in", meaning the motor mounts and tranny will bolt right up. Usually though the small block motor mounts are not strong enough and the oil pan will hit the crossmember. You can either buy big block motor mounts (which will bolt right in) or the poly motor mounts from click here
     
  7. wrath

    wrath 1/2 ton status

    Joined:
    Mar 4, 2001
    Posts:
    182
    Likes Received:
    0
    Location:
    Grayling,Michigan
    oh and one other thing..you may run into a problem with the powersteering pump and the way it mounts..I used the older steering pump and lines that came with BB..My 350 bracket wouldnt bolt to the BB.Other then that it was a real easy swap to do..If I think of anything else I'll touch base with ya..Just Do It

    70K5 350ci.350/205 "PROJECT 40"BOGGERS" It runs and its clean !!
    <a target="_blank" href=http://communities.msn.com/OurMudToys/the70k5blazer.msnw>http://communities.msn.com/OurMudToys/the70k5blazer.msnw</a>
     
  8. 87superblaze

    87superblaze 1/2 ton status

    Joined:
    Mar 12, 2001
    Posts:
    104
    Likes Received:
    0
    Location:
    Upper Michigan
    Thanks for the advise. The exhaust is a true dual 3" set up so it shouldn't be restrictive. As far as the A/C, is it possible to keep it or just forget about it. TOO much headache for what I get out of it. The blaze is a daily driver!!

    What or where do I find a fuel regulator to adapt to the FI system.

    Do I rip out the whole computer system as well?

    My Truck <a target="_blank" href=http://www.community.webshots.com/user/nicksm79>http://www.community.webshots.com/user/nicksm79</a>
     
  9. Topless84

    Topless84 Registered Member

    Joined:
    Dec 19, 2001
    Posts:
    25
    Likes Received:
    0
    Location:
    Michigan Detroit area
    87SuperBlaze, good question I've got an 84 thats getting a 454 soon, some good info in your responces. Your truck looks awesome.

    4X4 Once I got one, won't ever be with out one
     

Share This Page