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  1. #1
    Join Date
    May 2007
    Posts
    1

    Default Insatlling 455 into 1980 Regal ?

    Hi, I would like to install a 455 Buick Engine and Turbo 400 Transmission in a 1980 Buick Regal Station Wagon that currently has a 3.8 V6 and 3 speed automatic .

    Has anyone done this or know of what mounts I need, radiator, shroud, crossmember, driveshaft, etc. ??

    Thank you

  2. #2
    Join Date
    Jul 2006
    Location
    bowling green, ky
    Posts
    1,619

    Default Re: Insatlling 455 into 1980 Regal ?

    Go to the V-8 Buick Powered Regals section and click on the "sticky" at the top. This will tell you most of the information you require. Good luck with your swap. It was awful for me because I probable read more into the instructions (especially centering the motor) than was required. It was worse than chewing gum in your hair.

  3. #3
    Join Date
    May 2007
    Location
    AVENGER'S MANSION, New York City!!!
    Posts
    2,770

    Default Re: Insatlling 455 into 1980 Regal ?

    Hey. I did this swap twice already (V6 to Buick 455 ... Olds V8 to Buick 455);


    REMOVE REGAL'S HEADER PANEL, RADIATOR, AND HOOD FIRST.


    1. Connect Buick 455 motor to th400 short-tail 3-speed tranny.

    2. Remove original V6 or Olds V8 chassis mounts from chassis (and please
    don't believe the myth of the "holes" already being in the chassis
    for Poston's Buick-455 chassis mounts
    ).

    3. Remove the th200's crossmember ... keep it near, because the th400
    tranny mounts to it. Leave the "stock" drive-shaft attached to the rear
    if you plan on using the stock 7.-something peg-legged rear already on
    the car (my 307 powered Regals all had a 3:08-geared limited-slip rear).
    With this rear, you do NOT have to have the drive-shaft cut ... just buy
    the heavy-duty universals. MAKE SURE TO PURCHASE THE "TH400"
    YOKE!!! Bolt the 400-yoke to the 200-driveshaft!

    4. With motor OUT of Regal, bolt on Poston's chassis/motor mount combo
    for Buick 455 into G-body Regals.

    5. Cover the ends of both valve covers with towels ... and tape them down
    (this prevents one of damaging the heater's core or the firewall).

    6. With engine lift (and have a white can of spray paint present) , slowly
    lower the 455 engine/th400 tranny into the engine's bay. You will
    definitely need to "rock" the motor/tranny a bit till it rests correctly. I
    used plain eye-sight to ensure the motor being centered, but a thick
    string as ruler will serve the purpose. Now, after you are certain the
    drive-shaft bolts up and the motor is CENTERED (do not bolt
    completely ... you will need to remove the engine/tranny 1-last time),
    USE THE WHITE SPRAY PAINT and spray the edges of Poston's
    chassis mounts and Regal's chassis area WHERE THEY ARE TO BE
    BOLTED ON.


    7. REMOVE the 455engine/400tranny combo, then remove the chassis
    mounts from motor, place them on the Regal's chassis ... where the
    white spraypaint "template" is. NOW IT IS OBVIOUS WHERE YOU WILL
    NEED TO DRILL (with steel drill bit) the "new" holes for Poston's chassis
    mounts. (I recommend using a "3-way swivel rachet" to bolt one of the
    studs to the chassis/mount. There is a "oval-type" hole in the chassis
    where the fuel line is routed through...that will "kick-your-ass").

    8. Now comes the th200 transmission crossmember; put the
    crossmember into place ... DO NOT BOLT IT UP YET.

    NOW YOU WILL NOTICE EXACTLY HOW MUCH FARTHER "BACK" ON
    THE DRIVER'S SIDE YOU WILL NEED TO SLIDE THE CROSSMEMBER.



    9. After reinstalling the Buick455 and the th400 tranny into the slot on the
    th200's crossmember, SLIDE THE DRIVER'S-SIDE OF THE CROSSMEMBER
    @ 5-INCHES TO THE REAR. ONCE YOU ARE CERTAIN THE
    ENGINE/TRANNY/DRIVESHAFT/REAR ARE CENTERED, drill the NEW
    2-holes for the driver's side of the crossmember (I used a die cutter to
    open a "boxed area" on the chassis and slid the crossmember through
    that and bolted it down).

    10. Bolt the Buick 455 and th400 tranny finally to the Regal's
    chassis/crossmember, remove the taped-down-towels from the valve
    covers, bolt up the drive-shaft, and safety loop ... AND YOU ARE DONE
    WITH BUCIK455 ENGINE/TH400 TRANSMISSION/G-BODY REGAL SWAP!

    (There were NO throttle cable issues with either of my swaps! Additionally, the 307 Olds Regal radiator shroud works with this combo.)

    The fuseable link, vaccuum hoses, heater/radiator hoses, engine belts, OIL PRESSURE/TEMPERATURE GAGES ... and a TACH are all on you.

    Hope this helps you.

    Have a great weekend.

 

 

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