Chrysler contracted with legendary speed merchant, the late Vic Edelbrock, for the cast aluminum Six Pack intake manifold. During a 2008 interview conducted by Steve Magnante with Vic, he said: “Chrysler designed the manifold and when Dodge’s Bob Cahill gave me the drawings, he said ‘don’t change anything, just make it.’ We ended up making about 3,500 units before Chrysler brought production in-house and went to cast iron in 1970.” Today, Mopar® Performance still offers the Edelbrock Six Pack for 440 and 383 (low deck) applications.