Results 1 to 6 of 6

Thread: big block motor swap

  1. #1

    big block motor swap

    I have a 67 chevy impala convertible with a 350 sb that was put in place of a 327. So the Impala was originally a sb 327 car. I am new to the muscle car world. I am looking at a gm perf. parts 454 to put in the Impala. I know I will have to buy new motor mounts and bb headers. Is there any major concerns I should be aware of or will it be a pretty easy swap. Any suggestions or transmissions. I would like to get a transmission with overdrive but was told a TH 400 is more affordable. Will I have to move the transmission mount and if so is there different mounting spots on this particular car?? Any suggestions with my questions or an ideas would be greatly appreciated. I am nervous and somewhat fearful I may be getting in over my head. Due have numerous friends with more experience than me that are willing to help. Nervous in OHIO.[/b]

  2. #2
    Senior Member RACING JUNKIE fla1976's Avatar
    Join Date
    Aug 2007
    Posts
    1,527

    BBC

    I would see if I could borrow a BBC just to fit it up. I am thinking there may be a problem with the oil pan clearance. There is plenty of room under the hood.

  3. #3
    Senior Member RACING JUNKIE BEAST477's Avatar
    Join Date
    Feb 2007
    Location
    Michigan
    Posts
    1,908
    It wont be any real problems. I did basically the same swap 30+ years ago in a "66 Impala. Like you said different motor mounts and i think the frame has multiple holes for putting the cross member where you need it. I would put the turbo 400 in and hope its got rear gears in the 3.23:1 range and let the torque of the big block work for you.
    BEAST477






    Only a rich man can afford to use cheap parts.

    http://www.racingjunk.com/profile/177549

  4. #4
    Senior Member MASTER BUILDER
    Join Date
    Dec 2004
    Location
    out of my mind in Kalamazoo, MI
    Posts
    179

    Re: big block motor swap

    Quote Originally Posted by jason26933
    I have a 67 chevy impala convertible with a 350 sb that was put in place of a 327. So the Impala was originally a sb 327 car. I am new to the muscle car world. I am looking at a gm perf. parts 454 to put in the Impala. I know I will have to buy new motor mounts and bb headers. Is there any major concerns I should be aware of or will it be a pretty easy swap. Any suggestions or transmissions. I would like to get a transmission with overdrive but was told a TH 400 is more affordable. Will I have to move the transmission mount and if so is there different mounting spots on this particular car?? Any suggestions with my questions or an ideas would be greatly appreciated. I am nervous and somewhat fearful I may be getting in over my head. Due have numerous friends with more experience than me that are willing to help. Nervous in OHIO.[/b]
    I did my swap from small to BBC used the same motor mounts just sits a little back from original maybe about 1/2 inch closer the the firewall...can even fit a GM HEI in there too. Your engine bay has enough room to house a jet engine if you wanted to put that in place. Should be no problem at all installin a BBC under your hood....but have new mounts in place since then....so if your planning on the new mounts do it while you have the chance....I also have a built TH350 in back of mine with trans brake, 3800 converter....it is all in your planning

  5. #5
    Senior Member MASTER BUILDER
    Join Date
    Feb 2004
    Location
    IN
    Posts
    177
    I did this swap on my S-10! If it works there you should have no problem on yours. I didn't have to swap anything as all mounts went back where they were. The only major change you will see is that the BBC will extend forward (toward radiator) @ 4-4 1/2 inches closer than a SBC. Good luck. Dave
    http://i399.photobucket.com/albums/p...ber13417-1.jpg

    SEMPER FI!

    U can step on the brake
    U can step on the gas
    But step on ur crank
    Ur gonna get passed!

  6. #6
    Senior Member RACING JUNKIE
    Join Date
    Nov 2004
    Location
    St. Louis, Missouri
    Posts
    664
    You have an open field under the hood with plenty of room to play. Throw that BBC in there and slap a big fat blower on it. If she don't run atleast she'll look mean as hell.


Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Email us - Support@RacingJunk.com
Call us - 866.326.9227
Copyright © 2005-2016 RacingJunk.com All Rights Reserved.

Designated trademarks and brands are the property of their respective owners. Use of this Web site constitutes acceptance of the RacingJunk.com
Terms of Use, Classifieds Disclaimer, Privacy Policy, and Cookie Policy