What is the story behind What Is a 351 Cobra Jet? Get the answers in this feature article.
In 1970 the 428 Cobra Jet Motor was replaced with a 429 CJ engine. The change occurred in the middle of the production year so some early Cobra Jet cars had 428's, later cars were 429's. The 429 Cobra Jet package included: Bigger heads with larger ports and valves.