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 The SCJ, had a purpose built block...but most of them have been replaced by now.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