390 with 428 CJ exhaust 66 Cyclone

390 & up cid Monster Motors

390 with 428 CJ exhaust 66 Cyclone

Postby ENOLCYC » Tue Jan 22, 2019 8:44 pm

Just wondering will the 428 CJ exhaust manifolds work instead of the 390 GT exhaust manifolds in a 66 Cyclone.

I'm fairly certain they will just wondering if anyone has done it.

TIA
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Re: 390 with 428 CJ exhaust 66 Cyclone

Postby popscomet » Tue Jan 22, 2019 10:24 pm

bolt pattern the same?/………..pop
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Re: 390 with 428 CJ exhaust 66 Cyclone

Postby Lip Ripper » Wed Jan 23, 2019 5:07 am

What Pop asked. The front and rear bolts on the GT heads are about 3/8" lower than the rest across the top. I don't think CJ heads are.

And do yourself a favor. Sell the manifolds and pay Stan at FPA for his custom Tri-wye headers. The best $900 you'll spend on your car.

Stacey
66 Cyclone GT; 245/60R15's on 15x8's and 215/70R15's on 15x7 Magnum's.
There's nothing like the sound of a pushrod V8 singing at the top of her lung's.
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Re: 390 with 428 CJ exhaust 66 Cyclone

Postby ENOLCYC » Sat Jan 26, 2019 4:39 pm

Thanks for the info, I always assumed the CJ exhaust would work on the GT or Edelbrock heads. Picked the up years ago just never did the research.

Sorry it took me a bit to reply as I've just found a matching 66 Cyclone convertible, but in emberglow, may add to my fleet. Tried to add pic but too big!!

Kicker is that its only 2 miles from me
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Re: 390 with 428 CJ exhaust 66 Cyclone

Postby popscomet » Sun Jan 27, 2019 1:09 am

sounds to me you got more important things on your mind then an ill fitten exhaust manifold,,later pop
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Re: 390 with 428 CJ exhaust 66 Cyclone

Postby vicegrip » Sun Jan 27, 2019 8:49 am

ENOLCYC wrote:Just wondering will the 428 CJ exhaust manifolds work instead of the 390 GT exhaust manifolds in a 66 Cyclone.

I'm fairly certain they will just wondering if anyone has done it.

TIA

There was a 66 GT that came up on eBay that looked promising. No motor or trans but said it had the orig glass hood,very little rust. Was getting ready to bid as it opened for 4 grand but the listing ended as fast as it started,probably sold off line.
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Re: 390 with 428 CJ exhaust 66 Cyclone

Postby fryedaddy » Sun Mar 03, 2019 10:01 am

im not sure, i have forgotten alot over the years but the reason the gt heads and cj heads have 14 and 16 bolt holes is so they will work with either bolt pattern side to side or top and bottom,those cj manifolds may fit the side to side bolt pattern but like Stacey said the front and back top bolts are lowered on gt heads.you dont have to use all 14 or 16 bolts.top and bottom will work and side to side will work.i use to try and get all 16 bolts in my cj heads but with a good set of headers or manifolds either pattern is ok.
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