Welcome to the Mustang 428 Cobra Jet Registry!

Stock 428 Cobra Jet and Super Cobra Jet Engine Specifications

Bore4.130 inches
Stroke3.984 inches
Horsepower1968: 335 brake horsepower @ 5600 RPM
1969-1970: 335 brake horsepower @ 5200 RPM
Torque1968: 445 foot-pounds @ 3400 RPM
1969-1970: 440 foot-pounds @ 3400 RPM
Compression Ratio10.6:1

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The Mustang 428 Cobra Jet registry project is not related to the Ford Motor Company, Inc.

Logo design by Marc Tescione. Engine photograph courtesy of Jerry Heasley.

Does the scheduled build date represent the date that a car was actually assembled?

The best answer to this question is "usually not". Many factors could cause a discrepancy between a scheduled build date and an actual assembly date, such as shortages of parts, worker strikes, and any number of other things. From what we've seen, the actual assembly date tends to differ from the scheduled build date. As an example, we know that the scheduled build date for the start of 1969 model year production at the Dearborn, Metuchen, and San Jose assembly plants was "04G", or July 4, 1968.

New Site Search Engine

I just finished implementing a new search engine on the site that will hopefully do a better job of finding content. You might also notice a new "Related Content" block that lists other content related to the page you happen to be viewing. Happy searching!

Is a "Q-code" a Cobra Jet and an "R-code" a Super Cobra Jet?

There's a common misconception that the 5th character in the Vehicle Identification Number (VIN) can be used to determine if a car is equipped with a Cobra Jet (CJ) or Super Cobra Jet (SCJ) engine. The myth is that Q-codes are CJs and R-codes are SCJs. In truth, these codes identify the type of induction system installed during factory assembly. 1969 - 1970 428 CJs and SCJs that were equipped with standard air cleaners are identified by the letter "Q". Ram air induction is identified by the letter "R".

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