CJ exhaust on a 390GT?

610 Views 6 Replies 3 Participants Last post by 68gt390bench, Mar 21, 2001

68gt390bench

Discussion Starter · Mar 21, 2001

hi all,
I think I'm gonna go w/the s orig. type exhaust setup on my 390GT FB. However, down the line I'll prob. add CJ exhaust, heads and intake. I was wondering if I can get the 2.25 CJ exhaust - h -pipe and all and what I will need to do to match it up to the stock 390GT exhaust manifolds? My friend said I will just need some deals (the name of them escapes me now!!) that make the diameter of the H-pipe smaller so it will mate to the smaller 390GT manifolds. Does this make sense?

tia,
Mike

Mike
Cortland Manor, NY
'68 GT390 FB, 4spd bench seat
http://www.geocities.com/stangman39/stangsho.html

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1968KR

· #2 · Mar 21, 2001

I would suggest getting some CJ exhaust manifolds. The exhaust is only as good as the smallest opening. If you use the 2" 390GT manifolds, you'll be wasting your time putting the larger pipes all the way back.

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68gt390bench

Discussion Starter · #3 · Mar 21, 2001

I'll eventually get the CJ manifolds ($$ right now doesn't allow it!). I was trying to think of a way to save replacing the exhaust again when I do get the CJ parts a yr or so from now. Prob. just cheaper in the long run to get the 2" exhaust now. Prob. would not make too much sense now bolting up CJ exhaust to 390GT heads. Really need the while 3 pieces - the heads, exhaust and intake (which I have...)

thanks
Mike

Mike
Cortland Manor, NY
'68 GT390 FB, 4spd bench seat
http://www.geocities.com/stangman39/stangsho.html

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· #4 · Mar 21, 2001

The CJ exh man. look quite different. I don't think the H pipe would mount the same. I'm not even sure you could make a short adaptor or not. Someone on this site or on the FE sites will know....:

http://fomoco.com/forumfe/
http://network54.com/Hide/Forum/74182

Adrien.

65 GT Coupe, dismantled waiting for resto.
67 Restomod Coupe, in assy.
69 Mach 1, SWMBO say don't take it apart!
91 5.0 LX HB, driver.
http://albums.photopoint.com/j/View?u=1594363&a=12146434&p=44060413.jpg

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· #5 · Mar 21, 2001

Mike if you would like to see a set of CJ manifolds up close to compare them to your 390GT's to see if a conversion of any sort is possible send me an e-mail

Greg B

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cobra428jet

· #6 · Mar 21, 2001

The cobra jet exhaust manifolds will bolt up to 390 gt heads but you will have to relocate one hole on both heads but the cobra jet manifolds will flow better than the 390's and if you do put on cj heads later everything will bolt right up.
scott

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68gt390bench

Discussion Starter · #7 · Mar 21, 2001

Hi all,
thanks for the responses. I do know what CJ manifolds look like - I had them along w/CJ heads and intake on my 390GT '68 coupe. I guess I'll just go with the 390GT dtock exhaust setup and when the time comes down the line I'l lupgrade to the CJ setup when I put the CJ parts on.

thanks,
Mike

Mike
Cortland Manor, NY
'68 GT390 FB, 4spd bench seat
http://www.geocities.com/stangman39/stangsho.html

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