what long tube headers will fit on an ls1 in an 89 mustang? i know the 351's will fit if you put the ls1 flanges on em but will a set of ls1 headers fit?

 

no it will take a lot of work. i put bbk 1 7/8 351 w swap in my car and thay fit real good

 

what all had to be modified besides the flanges? pics would be awesome!

 

what about some mac mid lengths? thats what the guy has thats selling me the motor?

 

i will try to get you up some pics

 

In my experience the MAC mid's did not fit. I used the AJE SBC swap K and the headers interfered directly with the steering shaft.

Madman said he used a three joint steering shaft but they used a different K so that makes a difference...we tried the three joint idea with the AJE K and the angles were just too steep for the joints to work properly. I ended up having a guy retool some f-body Pacesetters:






Sorry for the hijack but pics speak louder than text!

 

thanks man that helps alot.

 

i think if the mac mid's "fit" ,there would be alot more ls1 mustangs done...

 

yeah i was just wondering cuz the guy had some on hand but i will prob just go with the 351's i guess. do you have to adjust the steering alot or not really?

 

I am in the same boat as you. I have it a little easier though. I am using a motor plate instead of motor mounts. Therefore the only thing that could get in my way is the steering shaft. I am hoping that I can find a set of LS1 headers that I can slightly modify to fit, instead of spending big bucks on some 351 headers and having to completely replace the flanges.

I will keep everyone updated on my progress. I am in the process of selling my house right now though, so things are moving quite slow.

Thanks,

Chris

 

One reminder, the f-body Pacesetters are too short to properly clear the fox body floor-pan, they just barely make contact and prevent the flanges from lining up with the exhaust ports...on both sides. Also the driver side header collector points away from the tranny, further hitting the frame rail.

 

How about a C5 header? They tuck pretty closely to the motor and go pretty straight towards the rear of the car. Or would a C5 header hit the f-body oil pan and/or the th400 tranny?

Chris

 

i think the best bet would be some GTO or truck headers

 

Anyone tried anythinge else here? Im getting colse to needing them ans was curious... Im sure there is some new blood to the theory with all the cars in the works....

 

Get a welder and make 'em fit.

I used cheap Summit Racing 302 Ford specials, and rerouted one tube per side.

 

Where did you get flanges?

 

They're a GM part, you can pick 'em up at any dealer.

 

Thanks, guess I need to search for that next....