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Hi. I'm putting a 1966 389 in my 1984 grand prix. I was wondering if anyone knows if there any headers that will fit without doing any fabrication?

It's a 1984 grand prix that I'm doing this in.

Hi. I was wondering if anyone e knows what mounts and brackets to use? I had a 400 in it but not sure if I can use same mounts and hole location. Thanks!

Yes it is and thanks I will.

I put a 1970 400 in my 84 grand prix. Was wondering if anyone knew what upper radiator hose to use? Thanks

Yes it was a 3 speed. I got the pan bracket for the 400 but cable is 2 inches short of placement.

I have a 84 grand prix and put a 1970 pontiac 400 with 400 turbo transmission in it. I've got everything hooked up except have trouble with shifter cable. I tried using the original one from the grand prix but it's to short. Wondering if I have to use the 1970 cable or is there a different option?

I found out the 70 grand prix that has right caps on it had wrong transmission yoke on it. I was wondering why when I put it in it wasn't going in all the way and we'll that's why it was to long.

Thanks for all the info guys. I've solved the issue and can wire up the engine now.

Yes they r the 69 joints. ...I also think I saw someone post about grand national joints...the original stock caps fits from the 84 on to the 69 and if I put them on the 69 I have just a little wiggle will that matter?..or do I need them tight? ...or when I put clamp on it will it run just as same?

84gp455....I have 342 with stock 10 bolt posi....the 69 driveshaft I have is length I need it's the rear u joints caps that r about 1/8 to big to slide all the way in differential....any ideas or did u run in to same thing and was fine? And I'm trying to see and look up universal caps but no...

Thanks...I will check out the u joints.

Thanks I will check that out.

Hi. New to this site but was told best place for advice. So I have a 1984 grand prix and switched from a chevy 350 to a pontiac 400 from a 70 grand prix. The trouble I'm having now is the drive shaft. I know u can shorten the shaft but I'm not sure if I'm measuring right. The shaft that came...

I'm putting a 1970 400 engine in a 1984 pontiac...will those engine brackets work?

Im putting a 1970 pontiac 400 in my 1984 grand prix and having alot of of trouble finding the motor mount brackets. I found what says the rh bracket but not the lh bracket....any help plz!!!!!!

I was looking for the 2 flange but in worst case i could switch. Ho w much would u want? And do you have any other parts from the 400 like starter altanator anything?

hey spider...i m interested in manifolds...they r 2 bolt flange? and yes i have right mounts...only thing i need is manifolds and from what im hearing ram air 3 is what i should go with

im putting a 1970 pontiac 400 in my 84 grand prix. having trouble with exhaust manifolds. the dumps on the 400 are in the middle and hit the frame...i need the dumps at back of block. any ideas?

Re: what motor mounts to swap 69 gto engine to 67 gto 400 en Thank you alot...i think ive found them. Ill let you know