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.

? about heads

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by GONZO, Jun 4, 2001.

  1. GONZO

    GONZO Registered Member

    Joined:
    Feb 20, 2000
    Posts:
    59
    Likes Received:
    0
    Location:
    Great Falls MT
    will the aluminum heads from a newer 5.3L chevy fit on my 85 350? if they do how does $300 plus shipping sound?

    <font color=blue>85 k5 Blazer 4x4
    99 Trans am 30th anniversary
    79 Trans am [​IMG]
     
  2. tori89k5

    tori89k5 1/2 ton status

    Joined:
    Apr 12, 2001
    Posts:
    946
    Likes Received:
    0
    Location:
    Pismo Beach, California
    NO THEY WONT.

    New '90 K5 sitting in my driveway !!!
    <A target="_blank" HREF=http://www.tori89k5.coloradok5.com>http://www.tori89k5.coloradok5.com</A>
     
  3. Seventy4Blazer

    Seventy4Blazer 3/4 ton status

    Joined:
    Apr 21, 2001
    Posts:
    5,634
    Likes Received:
    0
    Location:
    Escondido, CA
    i know the vortec heads of a new 350 fit. but you have to machine your block. they cost the same too. i am not sure if they are the same as the 5.3L though. but i have seen it done. the motor performs well too.

    1974 Chevy Blazer Cheyanne. lots of plans for it....
    but it is on 33's now, with saggy old springs. i am in so cali if ya got any parts for me.
     
  4. DMK

    DMK 1/2 ton status

    Joined:
    Feb 20, 2000
    Posts:
    757
    Likes Received:
    0
    Location:
    CINCINNATI, OH
    No.
     
  5. GONZO

    GONZO Registered Member

    Joined:
    Feb 20, 2000
    Posts:
    59
    Likes Received:
    0
    Location:
    Great Falls MT
    thanks

    how good are the 350 vortec heads? is it a worhtwhile expense?

    <font color=blue>85 k5 Blazer 4x4
    99 Trans am 30th anniversary
    79 Trans am [​IMG]
     
  6. dyeager535

    dyeager535 1 ton status Premium Member

    Joined:
    Dec 13, 2000
    Posts:
    26,980
    Likes Received:
    189
    Location:
    Roy WA
    Very good head, with major improvements over most heads, and slight advantage even over the revered "camel hump " heads out of the 60's, commonly called "fuelie" heads as well I've heard lately. (not sure why, since they weren't put on just FI vettes) Do a search for posts on Vortec heads.

    Dorian
    My tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
    No anti-theft measures on your truck? No pity when its stolen
     
  7. Pure Insanity

    Pure Insanity 1/2 ton status

    Joined:
    Mar 17, 2001
    Posts:
    4,579
    Likes Received:
    0
    Location:
    Dade City, Florida
    For vortec heads you do NOT need to machine the block, it's a direct bolt on. They do require a different intake tho. I'm not sure what seventy4blazer seen ,(unless i am totally reading his post wrong) but the 5.3 heads wont go on an early style block. Totally new animal, NOTHING will swap on these 2 motors.

    PURE INSANITY
    86 blazer see it at:<A target="_blank" HREF=http://www.zing.com/album/pictures.html?id=4292792569>http://www.zing.com/album/pictures.html?id=4292792569</A>
     
  8. Seventy4Blazer

    Seventy4Blazer 3/4 ton status

    Joined:
    Apr 21, 2001
    Posts:
    5,634
    Likes Received:
    0
    Location:
    Escondido, CA
    yes, the 5.7L vortec heads do fit. the block need machined and you have to use an intake that matches the vortec heads. call me a liar if you want, i dont give a $h!t

    1974 Chevy Blazer Cheyanne. lots of plans for it....
    but it is on 33's now, with saggy old springs. i am in so cali if ya got any parts for me.
     
  9. dyeager535

    dyeager535 1 ton status Premium Member

    Joined:
    Dec 13, 2000
    Posts:
    26,980
    Likes Received:
    189
    Location:
    Roy WA
    No machining necessary of the block. Friend thought the dowel pins were different, but they are not. Only machining that might be necessary is if you want to risk your heads, and drill them for an earlier style intake. Everything else about them is the same, except lack of heat crossover, which is not opened up. I've got a pair of vortec heads in my garage that are going on my '69 350 block. Guarantee no machining will be necessary.

    Dorian
    My tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
    No anti-theft measures on your truck? No pity when its stolen
     
  10. Blazer1970

    Blazer1970 1/2 ton status

    Joined:
    Feb 17, 2000
    Posts:
    1,600
    Likes Received:
    0
    Location:
    Old Mission, MI
    Definitely no block machining required to bolt Vortec heads on an older block (ANY gen 1 or gen 2 SBC block for that matter). I have them on my motor (original motor from '72 Blazer), and they bolted right on.

    Tim

    70 Blazer CST 4X4 350 SM465 NP205
    87 Burb 4X4 350
    01 GMC 2500HD 4X4 Duramax/Allison
     
  11. Pure Insanity

    Pure Insanity 1/2 ton status

    Joined:
    Mar 17, 2001
    Posts:
    4,579
    Likes Received:
    0
    Location:
    Dade City, Florida
    Easy there 74!!! If you read what I posted I said unless I'm reading you post wrong. I wasnt callin you a liar!!! I know you need the special intake manifold, I HAVE the intake!, on my vortec heads!! I was making reference to the 5.3 heads on the Gen 1 and 2 blocks. Now as far as the machining of the block, that is incorrect. There are too many of us that have those heads on our rides to not have an idea what it takes to install em.

    PURE INSANITY
    86 blazer see it at:<A target="_blank" HREF=http://www.zing.com/album/pictures.html?id=4292792569>http://www.zing.com/album/pictures.html?id=4292792569</A>
     

Share This Page