$projecthp
  • Longblock swap for a 1984 crossfire C-4
  • Longblock swap for a 1984 crossfire C-4
  • Longblock swap for a 1984 crossfire C-4
  • Longblock swap for a 1984 crossfire C-4

Results 1 to 7 of 7
  1. #1
    New Member
    Join Date
    Sep 2015
    Location
    Nj
    Posts
    2
    Post Thanks / Like
    Rides
    0

    Default Longblock swap for a 1984 crossfire C-4

    Is it possible to swap a 1973 350 Longblock for the Longblock in my 1984 crossfire injection are there any physical differences in the head to manifold configuration in other words will the 73 bolt right up to the crossfire manifold ? Expert firsthand knowledge would be greatly appreciated.

  2. #2
    Site Administrator Rob's Avatar
    Join Date
    Sep 2000
    Location
    "Manchestah" NH
    Posts
    13,216
    Corvette(s)
    1990 ZR-1 - Bright Red / Black
    Post Thanks / Like
    Rides
    1

    Default

    Moving out of the Site Help and Feedback forum and into the C4 Crossfire forum...


    Rob Loszewski, Owner & Site Administrator
    Corvette Action Center
    Cadillac V-Net
    Cadillac XLR Net
    Torque About It
    Torque Network
    VetteTube
    NCRS Member #27792
    "Let your plans be dark and impenetrable as night, and when you move, fall like a thunderbolt." - Sun Tzu
    Thanks C4yourself thanked for this post
    Likes KANE liked this post
    1990 Chevrolet Corvette ZR-1 , 350 Stock ZF 6-speed. Stock Bright Red

  3. #3
    Moderator KANE's Avatar
    Join Date
    Mar 2002
    Location
    KY
    Posts
    3,236
    Corvette(s)
    Dark Blue 1982 Trans Am(s): Polo Green 1995 MN6
    Post Thanks / Like
    Rides
    1

    Default

    Quote Originally Posted by C4yourself View Post
    Is it possible to swap a 1973 350 Longblock for the Longblock in my 1984 crossfire injection are there any physical differences in the head to manifold configuration in other words will the 73 bolt right up to the crossfire manifold ? Expert firsthand knowledge would be greatly appreciated.
    C4yourself!

    Oh... first and foremost...


    Yes- you can swap out the engine (longblock with heads) for any pre-87 configuration of those and it will bolt up to the crossfire intake.

    Technically... even an 87 and later engine SBC Gen I (non-Vortec heads / non-LT1 reverse flow cooling) will bolt up too. On the 87 and up heads the center most bolts on the intake have a different angle- but there are adapter washers available. Or you could get the intake machined.


    Just curious though- whatcha building???
    1982 Dark Blue Corvette
    Crossfire Injection | .496"/.495" Cam | AFR Eliminator Heads | EBL | 3.73
    0-60mph in four and a half seconds



    1995 Trans Am
    1 of 1 Trans Am | 100% documented | RPOs 48U, MN6, and GU6
    Thanks C4yourself thanked for this post
    1982 Chevrolet Corvette , 350 2k RPM Stall Converter + Updgraded Transmission + Governor Set For 5,450rpm Shifts 3.73 Code 42 Dark Mettalic Blue with a twist

  4. #4
    Member
    Join Date
    Mar 2014
    Location
    Columbus, NC/NE Georgia
    Posts
    2,293
    Corvette(s)
    1997 boosted silver coupe
    Post Thanks / Like
    Rides
    0

    Default

    Welcome to CAC and the group; we're glad to joined us..

    I second the question:

    Quote Originally Posted by KANE View Post
    Just curious though- whatcha building???
    Whoosh, and blur
    Thanks C4yourself thanked for this post
    Likes C4yourself liked this post

  5. #5
    New Member
    Join Date
    Sep 2015
    Location
    Nj
    Posts
    2
    Post Thanks / Like
    Rides
    0

    Default 750HP actual 383ci

    Quote Originally Posted by KANE View Post
    C4yourself!

    Oh... first and foremost...


    Yes- you can swap out the engine (longblock with heads) for any pre-87 configuration of those and it will bolt up to the crossfire intake.

    Technically... even an 87 and later engine SBC Gen I (non-Vortec heads / non-LT1 reverse flow cooling) will bolt up too. On the 87 and up heads the center most bolts on the intake have a different angle- but there are adapter washers available. Or you could get the intake machined.


    Just curious though- whatcha building???
    750 HP 383ci. very healthy build less than 100 miles on it out of my Nova pro street all forged internals aluminum heads and blueprinted. Now all I have to do since you have confirmed the swap able to be achieved my next inquiry will be HOW to get more CFM out of the TBI because I want to keep the crossfire setup I know I will be compromising power due to the loss of the larger carb that is currently on the engine now I believe the crossfire provides approx 450CFM which is a significant difference any suggestions would be appreciated and thank you for the longblock swap confirmation
    Likes KANE liked this post

  6. #6
    Moderator KANE's Avatar
    Join Date
    Mar 2002
    Location
    KY
    Posts
    3,236
    Corvette(s)
    Dark Blue 1982 Trans Am(s): Polo Green 1995 MN6
    Post Thanks / Like
    Rides
    1

    Default

    Find an Offy intake, bore the TBI units out to 2.1 inches, run the TB units parallel with a VAFPR, run 90lb injectors, get an LT1 fuel pump, and go with an EBL ECM.

    That's the short list you'd need.

    I don't think your OEM crossfire intake will meet that engine's needs.



    But man- if you get that running with crossfire.... WOW!


    Sent from my iPhone using Tapatalk
    1982 Dark Blue Corvette
    Crossfire Injection | .496"/.495" Cam | AFR Eliminator Heads | EBL | 3.73
    0-60mph in four and a half seconds



    1995 Trans Am
    1 of 1 Trans Am | 100% documented | RPOs 48U, MN6, and GU6
    1982 Chevrolet Corvette , 350 2k RPM Stall Converter + Updgraded Transmission + Governor Set For 5,450rpm Shifts 3.73 Code 42 Dark Mettalic Blue with a twist

  7. #7
    Moderator bill81vette's Avatar
    Join Date
    Jan 2004
    Location
    Troy,NY
    Posts
    4,170
    Corvette(s)
    1981 dark blue metallic
    Post Thanks / Like
    Rides
    1

    Default

    Welcome to CAC!!!!
    enjoy!!!!
    sounds like a bada$$ engine!!!!
    Bill and Gail...save the wave
    NCRS member 42415
    1981 St.Louis car #2735
    all matching numbers

    born Sept 18,1980
    Cruisefest 2008
    Cruisefestous 2009
    Cruisefest 2010
    Cruisefest 2011
    Cruisefest2012



    Without Trucks......
    You would be Hungry,Homeless and Naked!!!!!!



Similar Threads

  1. CrossFire Swap
    By pleiku10 in forum C4 Technical and Performance
    Replies: 10
    Last Post: 02-22-11, 08:23 AM
  2. 1984 4+3 CrossFire Rebuild
    By Outlaw in forum CrossFire Injection Mine
    Replies: 16
    Last Post: 11-11-10, 10:58 PM
  3. Need Help With Everything (lol)... Newbie 1984 crossfire
    By toddadam in forum C4 Technical and Performance
    Replies: 53
    Last Post: 07-25-09, 05:06 PM
  4. 1982 crossfire engine swap
    By wwilkins in forum CrossFire Injection Mine
    Replies: 2
    Last Post: 09-19-04, 11:24 AM
  5. These Heads for a 1984 Corvette 350 Crossfire
    By Outlaw in forum CrossFire Injection Mine
    Replies: 2
    Last Post: 07-04-03, 05:34 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •