engine swap?

[jospooner83cutlass]

dose anyone know how hard it would be to fit a big block 400 pontiac motor into a 1983 cutlass supreme?

 

[DoubleV]

Harder than dropping in an Olds engine, that's for sure. Don't know specifics for Pontiac's. I assume you need the proper fram mounts but after that I don't know anything else assuming the Poncho engine has all the right brackets

 

[78 salon]

Finding those frame mounts might be tough, considering they only put poncho engines in from 78-80 IIRC. P.S., there is no big block pontiac engine. 🙂

 

[jociha]

I believe the 80-81 Grand Prix still used a Pontiac V8 engine so you will need to start with those motor mounts, the big question is are those the same motor mounts pontiac used for many years before that, i think there is a good chance they are, and is the G body frame in 81 the same as 83, if so it should work. The Pontiac 400 is not a huge motor so it should fit just fine.

 

[565bbchevy]

I think you can use mounts from any gbody 78' and newer that came with a Pontiac 301 or possibly Trans Am/Firebird mounts that came with a Pontiac engine,though internally different I believe outside dimentions of a 301 are identical to 350,400 and 455 Pontiacs and also all accessories from a 301 should bolt up to the larger engines.

 

[jospooner83cutlass]

the engine is out of a 1975 trans am and i was going to try and make the motor mounts off of it work

 

[-83MONTESS-]

P.S., there is no big block pontiac engine. 🙂

Glad someone caught that 8)

 

[jospooner83cutlass]

i did not know all the blocks are the same size. not really a pontiac guy but the engine is free so what can i say

 

[BuickOldsPontiac]

I think you can use mounts from any gbody 78' and newer that came with a Pontiac 301 or possibly Trans Am/Firebird mounts that came with a Pontiac engine,though internally different I believe outside dimentions of a 301 are identical to 350,400 and 455 Pontiacs and also all accessories from a 301 should bolt up to the larger engines.

I am not sure about the f-body mounts, but yes any g body that came with either the Pontiac 265 or 301 would work. The years would be from 78-81 and I believe the Lemans, Grand Prix, Regal, and Century where all available with the 265 and/or 301 engines.

I haven't done any research lately on the Pontiacs, but I thought I remember some differences when it came to the accessories. :?:

 

[GT_80]

I am not sure on brackets, and motor mounts, but you will LOVE that 400! My buddy has a 67 GTO with worked stock D port heads, around 10.3:1 compression, comp Magnum 470 lift cam, and in that approx 4000 lb car, it HAULS *ss!!!