1980 Firebird - 301 to 400 engine swap

[1980Esprit]

Hello everyone, I am new to this site and am full of question!

First off, My dad and I own a 1980 Firebird Esprit with the non-turbo 301 olds and are wanting this 1972 pontiac 400 in. Making it fit is not the trouble. The trouble is...

Will the 400 fit with the stock 3 speed auto?

Will the mounts need to be changed?

If mounts need to be changed, what type will we need and any suggestions on good brands.

*(We will be rebuilding the 400 which was from a 1972 Parisienne/Laurentian)

 

[melsg5]

Buick, Oldsmobile, and Pontiac, BOP, share the same transmission mounting pattern. The mounts probably have to be changed and possibly the brackets. Look at what is available at www.amesperf.com

 

[1980Esprit]

So what type will I need it to fit. A 1972 mount to fit a 1980 bracket? Is there anything like this for a conversion kit? I didnt manage to find much on there.

 

[melsg5]

If you look at page 179 of the Ames Firebird catalog it appears they have what you need, FN621B. If still unclear, I advise you call them, they will be happy to help you.

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[79 bandit car]

Whats a tranny mout thingeee :}

 

[1980Esprit]

Alright, Thank you SO much!