Define the Cobrajet and a non Cobrajet diffrences please

What's the diffrence physically between a 66 428 4V premium fuel CJ, and a regular 428 4V Premium fuel non CJ engine.

Please.
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1st, there wasn't a CJ in '66. The 1966 428 was part of Fords plan to go up market with a top of the Line "Gentlemans Sporty car" by using the Mercury engine. They were used by Police cars (the PI), and in people hauler station wagons for their added torque. They wanted a bigger engine, without having to put the high maintenace 427 into regular production.

The CJ engine didn't appear until late 1968 as a Ford product to counter the solid lifter, 375 horsepower 396 that Chevy was sticking in Camaro's. It had been a option in the Malibu SS from '65, pulled from the Corvette parts bin. Ford had to make a decision, either put the expensive 427 back into street cars - remember, this was the beginning of insurance companies starting the propaganda against fast cars in general, especially in low cost packages that young drivers could afford. The GTO was out and all Ford had was the 390 and 390 GT.

An east coast dealer had put together a CJ, pre-cursor, using Ford Parts bin components as a performance package for his speed hungary customers. The story is...Ford became interested and took the idea under consideration - that was the beginning of the 68 1/2 Cobra Jet.

The 1st year CJ's (sold in late 1968 ...) were Land Yatch 428's, stuffed to the brim with 427 parts.

The first real production 428's, which came out in 1969 Mach1's were, closer to streetable. They used a modified FE head which was cored to match the mid-riser 427 design, but without all the expensive machine work and parts.

So, in answer to your question, there is very little difference between the CJ and a regular 428, but there is a lot of difference in the parts installed. Heads, cam, intake and carburator. The SCJ, had a purpose built block...but most of them have been replaced by now.

Not a definative answer, but good enough for Guberment work.

http://www.mustangandfords.com/thehi...ra_jet_engine/

...Enter Bob Tasca, a Ford dealer who had a history of experimenting with Ford big-blocks for his dealership-sponsored race cars. He had been involved in the Thunderbolt program back in 1964. His cars had been very successful, and word on the street was Tasca’s cars were working very well. Ford execs got the word. Tasca had bolted 427 Low Riser cylinder heads on the 428, which really woke up this mill and gave it much better breathing capability while retaining the low-end torque the big FE was already noted for. The big-block Chevy had the edge in breathing ability, but this move closed the gap between the two engines a great deal. According to the excellent Boss and Cobra Jet Mustangs by Dr. John Craft, this is how the Cobra Jet was born.



_________________
..."Experience is the best teacher, A fool will learn by no other"..."He that is good for making excuses is seldom good for anything else”...“We are all born ignorant, but one must work hard to remain stupid.”--Benjamin Franklin, (1706-1790)

<font size=-1>[ This Message was edited by: Beoweolf on 3/7/07 7:05am ]</font>

Remember, before the Cobra Jet, there was the Thunder Jet. Even though it was a lead sled motor in big Fords.
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Hmmmm. I thought that CJ 428s were all stronger due to increased ribbing of the block itself, for one.
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Sorry for my ignorance, but what's the diff between a 427 and 428? Block? Heads? Are they really different displacement (bore/stroke)? I always thought they were both FE's, just different bolt-ons...
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427 has a 4.234" bore by 3.78" stroke. 428 has a 4.13" bore by a 3.98" stroke. In essence you can't make a 427 out of a 428. You can't bore a 428 to 4.234" There are many other differences, cylinder head options, crossbolt mains, side oiler oiling for some 427's, most 427's were not drilled for hydraulic lifters and there are more differences but that is the meat of it.

Hmmm ... and I heard ... If you really want to make power ...

Build a 385 series ... because the heads are "Head and Shoulders" better than any FE.

But ... there's certainly something to be said for that "Mystical FE." [img]/forums/images/smiles/icon_wink.gif[/img]
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The Cj motors had heavy duty rods and bolts as well as better heads with bigger valves..They also had a better flowing intake and holley 735cfm carb with free flowing exhaust manifolds and bigger cam..Many other small differences but those are the biggest ones.
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On 2007-03-06 16:14, v8shadow wrote:
Hmmmm. I thought that CJ 428s were all stronger due to increased ribbing of the block itself, for one.

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Yes the SCJ did have a stronger block...

...The SCJ's, had a purpose built block...but most of them have been replaced by now...

...they had additional webbing and reinforcement in the crank area. There was also some attempt at crank counterweights, probably to off-set the additional weight of the "LeMans" 427 rods used for strength. Its a whole 'nuther animal, for good information, you really need to do some detailed research. Depending on memory and half-forgotten facts, dates and part numbers will just cloud the issue. If you are actually interested in Cobrajets, super cobra jets - nothing beats doing the research yourself, that way you can concetrate on what you want to know instead having to wade through what someone else decides is important.


Ps. - unless I have my facts totally mixed up. The Thunder Jet was a 429, not a 428.

It too started out as Land Yatch big block. It, was part of the Lima engine series (370 thru 460), was the replacement for the FE series of engines. Even though the 70 CJ and SCJ line was rate at a higher horsepower, until a few years ago they were not as sought after or respected as the FE series. Probably because they didn't have the benefit of a factory racing heritage or something like the Cobra or a champion like Carroll Shelby to kick start the imagination of hormonal Teen-agers. Then there was the "little" gas crisis thing in the 70's, plus the insurance companies were just getting started on their 12 year campaigne to demonize any car that could get out of its own way...85 mph speedometers, insurance higher than your monthly car payment...sure could put a damper on a young boys dreams.

Obviously, that oversight has been corrected in the last 10 years or so. You can stroke the factory 429/460 block to nearly 600 cubic inches. The biggest, factory FE, tops out somewhere south of 500 ci.

_________________
..."Experience is the best teacher, A fool will learn by no other"..."He that is good for making excuses is seldom good for anything else”...“We are all born ignorant, but one must work hard to remain stupid.”--Benjamin Franklin, (1706-1790)

<font size=-1>[ This Message was edited by: Beoweolf on 3/7/07 9:07am ]</font>

You know Wolf, I just bought a great book about this. Im gonna put a link to it here soon.

http://www.amazon.com/How-Rebuild-BI...3233108&sr=1-1

_________________
KEN
Factory 65 Galaxie 500 390/4v

<font size=-1>[ This Message was edited by: v8shadow on 3/7/07 9:06am ]</font>