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  #1 (permalink)  
Old 12-13-2005, 06:27 PM
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390 GT?? what's different

well i was looking at my old intake manifold (stock) getting ready to sell it and i noticed that it said "gt" on it i wasn't aware that thunderbirds came with 390gt motors i thought that was only the high performance cars like galaxies and mustangs and that stuff, i told my dad and he seems to think it might have been made at the end of the year and they ran out of regular motors and just threw in a 390gt cause they were out of the normal 390. and what is different between a 390 and a 390gt?

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Old 12-13-2005, 06:51 PM
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I am not a Ford guy, but assuming that your intake is cast iron, I cannot imagine Ford using a cast iron intake on a GT engine. My suspicion is that the GT on your manifold means something other than what you think it is.

Vince
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Old 12-13-2005, 08:34 PM
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Quote:
Originally Posted by 302/Z28
I am not a Ford guy, but assuming that your intake is cast iron, I cannot imagine Ford using a cast iron intake on a GT engine. My suspicion is that the GT on your manifold means something other than what you think it is.

Vince
I'm a Chevy guy too but I was surrounded by Ford fanatics as a kid back in the 60's and several of them had Fairlane and Mustang 390 GT's and they all had cast iron intakes, Ford used cast iron intakes on a LOT of their performance engines. IIRC the 390 GT had a little more cam and compression and possibly a larger cfm carb but otherwise looked like a standard 390.
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Old 12-13-2005, 11:59 PM
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Quote:
Originally Posted by 66 T-Bird

what is different between a 390 and a 390gt?
The basic difference are cylinder heads, camshaft and HOLLEY carburetion rather than AUTOLITE/MOTORCRAFT.

Most FORD performance engines came through with a cast iron intake, including the 428CJ. The 427 was a completely different story.

There may still be a small metal I.D. Tag attached to the coil mounting bracket. This will give you assembly details.
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Old 12-14-2005, 08:48 AM
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yeah it's the original engine and it kinda makes me wonder why ford put a high performance engine into a car that wasn't built to be high performance??? did they just run out of standard performance engines or something? and i think it had a autolight carb on it but it's the original motor and intake manifold
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Old 12-14-2005, 10:31 AM
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may have been a dealer special order, 6XXX"S"= 335HP 4V/390 (#'s stamped on the inner driver fender and door data plate)
may have been a 4V manifold swap "H, Y, X"=2V/390
may have been "the line never stops at Ford" ($250 option)
may have been a warrentee motor swap/rebuild

60's birds and FE motors= lot's of combo's available as options
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Old 12-14-2005, 10:50 AM
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The PI Police Interceptor cars got alum intake manifolds (and solid lifters usually). Everything else with single 4bbl got cast iron. I don't think Birds got 2 bbl carbs.

The GT cars had dual pattern exhaust manifold bolt holes so that they could be used in various late 60s bodies. I don't know if 66 castings did or not. The FE head casting numbers are next to the two inner spark plugs. That might be valuable.

To the best of my recollection.... the GT manifolds did not have GT cast in them but rather relied on the usual casting number sequence for ID.

And yes, he is correct. The assembly line never stops..... There have been some pretty unusual things roll out the door.
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Old 12-14-2005, 10:54 AM
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Quote:
Originally Posted by 66 T-Bird

yeah it's the original engine and it kinda makes me wonder why ford put a high performance engine into a car that wasn't built to be high performance??? did they just run out of standard performance engines or something? and i think it had a autolight carb on it but it's the original motor and intake manifold
I doubt very seriously it is an actual 390/335HP, most likely they ran short of S intakes at the engine plant and substituted what they had at assembly.

As for the BIRD not being a performance offering, the 428 (non-CJ was available as an option. At that time it was considered a luxury/performance car.
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Old 12-14-2005, 12:09 PM
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xntriks probably correct, no 2V 66' birds but:

in 66' there were 3-5 (?) different 4V/390 HP "options" it is kinda unique if it is a "S", but not special for HP that was available (330hp=normal "optional" bird motor?)

"Z"= police interceptor 4V/390 ???

been to long since I messed with FE motors (CRS desease=can't remember sxxx!)
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Old 12-14-2005, 01:22 PM
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The Ford 390 intake manifold in the T-Birds had a S cast onto them, it didn't matter if it was a 4 barrel or 2 barrel carb intake. The 390 I put in my 67 F250 came out of a 66 T-Bird that had a 2 barrel carb and it has a big S cast on the intake. I am not 100% sure but isn't the letter S used in the VIN for identifying the T-Birds.
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Old 12-14-2005, 01:47 PM
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Most likely it was a substitution, either due to a parts shortage, or possibly due to a running change or balance out (e.g. we are done building these, use those others, they are at least as good)...... Happens less now than it used to due to more red tape, in my younger days it happened all the time.
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Old 12-14-2005, 02:16 PM
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onebadmerc,

in order on the plate or inner fender stamping:
digit=last digit of year built
letter= which assembly plant
2 digits=body serial code/body style code
letter= engine code (S=390/335)
6 digits= serial/consecutive number

yup, S=bird, original vehicle id codes for parts, C (60's) 6 (66') S (bird) E (engine) - xxxx - x = your intake code= C6SE xxxx x

M=merc, Z=mustang, D=falcon T=truck etc.
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Old 12-14-2005, 02:23 PM
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http://automotivemileposts.com/tbird...fications.html

Here we go- only 3 engines available in 66 T-birds

vin codes:

code Z = 390/ 315 hp 4 bbl.
code Q = 428/ 345 hp 4 bbl.

code 8 = 390/ 265 hp 4 bbl -low compression for regular gas EXPORT ONLY
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Old 12-14-2005, 02:50 PM
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Quote:
Originally Posted by xntrik

The PI Police Interceptor cars got alum intake manifolds (and solid lifters usually). Everything else with single 4bbl got cast iron.

The GT cars had dual pattern exhaust manifold bolt holes so that they could be used in various late 60s bodies. I don't know if 66 castings did or not.
Some PI's received the aluminum intake, it depended on the package ordered (390/428). Street 427's (also early 352HP/390HP and 406's) came with an aluminum 4V intake.

Dualing exhaust mainfold patterns began in 1966 for the FAIRLANE/COMET. After initial release, all assembly and service replacements had the dual pattern.
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