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80 TRANS AM MOTOR SWAP FROM 301 TO 79 400

  
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80 TRANS AM MOTOR SWAP FROM 301 TO 79 400

 
SIMCOECOLLISIONCENTRE SIMCOECOLLISIONCENTRE
New User | Posts: 2 | Joined: 04/14
Posted: 04/02/14
09:33 AM

on the 80 trans am are the motor mounts in the right place to swap in the 400 big block?? my motor builder said they should be in the right place because the 301 is considered a big block ....is this true ?? i just want to make sure that the shaker will line up....HELP  

tuffnuff tuffnuff
Moderator | Posts: 2567 | Joined: 12/09
Posted: 04/02/14
10:19 AM

Yes.,. the 400 will bolt right in

Smile  
When The Flag Drops.,.

tuffnuff

The Bull ***t Stops.,.
tuffnuff

P. Engineer, Engine Builder

Pontiacman8 Pontiacman8
Moderator | Posts: 5777 | Joined: 02/08
Posted: 04/02/14
12:52 PM

+1 it will bolt right in ,but you will need to use the accessory brackets for the 400 as the 301 brackets are different.
Also Pontiac never made a big or small block they where just specified by cubic inches.  
Engine builder,self taught auto body guy.
Horsepower sells engines and torque wins races

Pontiacman8
Pontiacman8
Pontiacman8

ROWSLEY ROWSLEY
Guru | Posts: 1016 | Joined: 07/11
Posted: 04/03/14
07:29 PM

the shaker will need to be modified to fit the 400.  
76 455/4spd TRANS AM
69 GRAND PRIX 455/5SPD

barneyformula barneyformula
Addict | Posts: 3306 | Joined: 01/07
Posted: 04/05/14
08:50 AM

Yes, the 301 is a short-deck motor so the shaker will sit higher on the 400, not an issue if the car had the turbo hood of course. I've heard of people using the 301 shaker if the motor mounts are soft. Not that I recommend it.  
A little help... 'cause we don't all have to learn the hard way!

Casper77 Casper77
User | Posts: 61 | Joined: 01/14
Posted: 04/13/14
12:10 AM

I'll assume you're running headers but if not the y-pipe & manifolds will also be a problem.