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Old Aug 10, 2008 | 02:56 PM
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1985 Ford F-150's Avatar
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Cast manifold

I have a 4bbl cats iron manifold that was given to me with my truck. It has an S cast into it on the top of it the castin numbers are c7ae 9425-e. I know its an FE manifold and also has the smaller holes for the intake.
 
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Old Aug 10, 2008 | 03:31 PM
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Originally Posted by 1985 Ford F-150
I have a 4bbl cats iron manifold that was given to me with my truck. It has an S cast into it on the top of it the castin numbers are c7ae 9425-e. I know its an FE manifold and also has the smaller holes for the intake.
Well this would be an intake manifold from a 1967 390.
 
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Old Aug 10, 2008 | 06:05 PM
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Ok thanks what does the S mean
 
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Old Aug 10, 2008 | 07:44 PM
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S means nothing really. There are both S and T intakes. Protocol was the S intakes went on the cars. And the T intakes on the trucks. Both castings year for year are just about identical. T intakes can be found on cars and S intake on trucks. Ford didn't stop production cause they were out of S intakes for cars. Some think the S intake to be true to the S code 390's. But that's not really true being found on most standard FE applications. Although it is found stock on the S code 390 cars as well.
 
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Old Aug 10, 2008 | 08:30 PM
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Ok so its nothin special then.
 
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Old Aug 10, 2008 | 10:43 PM
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It is suppose to give better fuel economy and low end throttle response over the earlier large port manifolds by keeping fuel/air mixture velocities higher at low engine rpm.
 
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Old Aug 10, 2008 | 11:05 PM
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Originally Posted by 1985 Ford F-150
Ok so its nothin special then.
I'm starting to wonder now. Last year I could have my choice of S or T intakes. Now that I'm looking for one, all I find is the older intakes with the tall runners. Not so good on the newer heads with smaller intake ports.

I promised a bud I'd find one for his bumpside. The $20 the pull-yo-shait wants makes it affordable...when I find one. LOL That with a 600 CFM 4V carb should get his truck double-digit fuel economy.
 
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Old Aug 11, 2008 | 11:48 AM
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Originally Posted by timothyboatman84
Well this would be an intake manifold from a 1967 390.
1967 and LATER until they came out with a new casting or just came out with an updated part number.

Just like C8 heads were used up until 1972 when they came out with the D2's which were the exact same thing, casting-wise (except for induction hardened seats which had nothing to do with the casting).

Usually, the rule of thumb is the date in the part number (C7 for the intake in question) was the first model year it was used. Not the ONLY model year.
 
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Old Aug 11, 2008 | 11:57 AM
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Originally Posted by krewat
1967 and LATER until they came out with a new casting or just came out with an updated part number.

Just like C8 heads were used up until 1972 when they came out with the D2's which were the exact same thing, casting-wise (except for induction hardened seats which had nothing to do with the casting).

Usually, the rule of thumb is the date in the part number (C7 for the intake in question) was the first model year it was used. Not the ONLY model year.
And...the casting number, which cannot be cross referenced to an actual Ford part number may be for a part that Ford needs to make more of.

So....the part might fit earlier models too.

The same thing holds true for actual part numbers. Ford updates 1000's of part numbers a year, so a part with an E6DZ (1986 Taurus) prefix may fit all the way back to 1932.

As a matter of fact, at least one does!

B-1012 replaced by B-1012-A replaced by C0AZ-1012-A replaced by C9AZ-1012-A replaced by E6DZ-1012-A .. Lug Nut.

Knowledge of how Ford operates, parts catalogs, master cross reference catalogs, obsolete-supercede-interchange catalogs are ALL necessary to find out what fits what.

And some of y'all think this job is EZ? Think again...it ain't!
 
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Old Aug 11, 2008 | 11:59 AM
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I have both a big port and a small. Im runnin an edelbrock carb and manifold with a 260H cam and lifters. I did throw that big port one on it along with some 428 heads with the big ports I had rebuilt with a 268 cam and it made better power than it does now but it started eatin a lifter so we had to take it back down and the cam was garbage. My dad saw this 260H on the jegs site and thought it would be better for pullin trailers and stuff, but I think the 268 was better. Which manifold would give me the most power. I also matched the port size thats on it now.
 
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Old Aug 11, 2008 | 12:09 PM
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Originally Posted by NumberDummy
And...the casting number, which cannot be cross referenced to an actual Ford part number may be for a part that Ford needs to make more of.

So....the part might fit earlier models too.
VERY TRUE!
 
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Old Aug 11, 2008 | 12:18 PM
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Double frickin' post.
 
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Old Aug 11, 2008 | 12:20 PM
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Originally Posted by 1985 Ford F-150
I have both a big port and a small. Im runnin an edelbrock carb and manifold with a 260H cam and lifters. I did throw that big port one on it along with some 428 heads with the big ports I had rebuilt with a 268 cam and it made better power than it does now but it started eatin a lifter so we had to take it back down and the cam was garbage. My dad saw this 260H on the jegs site and thought it would be better for pullin trailers and stuff, but I think the 268 was better. Which manifold would give me the most power. I also matched the port size thats on it now.
Listen to your Father! This applies in this case;

"To be old and wise you must first be young and stupid."

You don't tow with horsepower, you tow with torque and the 260H cam is a much better torque cam.
 
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Old Aug 11, 2008 | 12:26 PM
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Ok do you think it was just the manifold and heads from the 428 that made the difference.
 
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Old Aug 11, 2008 | 12:31 PM
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Originally Posted by 1985 Ford F-150
Ok do you think it was just the manifold and heads from the 428 that made the difference.
Stock 428 heads and intakes are identical to the 390. So no, they are not better. Even the PI uses the same heads. You have to go CJ to get the better heads.

The extra 38 CID helps but they were pretty optimistic on the stock 428 horsepower. Hell, the stock 428 used the same carb as the 390 4 barrel.
 
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