For others like me that did not know about IR systems:

Designed to run one isolated barrel per cylinder. This sort of setup is known as an Independent Runner. Holley’s big-CFM Dominator was only a viable wide-band power proposition because of its intermediate cruise circuit and the use of high-gain annular discharge boosters.

Now you know.
It was the set-up the Trans Am Mustangs were intended to use in 1969. The SCCA inspectors saw the set-up and changed the rules making dual carburetors illegal. They are the only Holley carburetors ever made for IR "out of the box".

The carbs are actually under-sized for a 351 ... but they're bigger than 48mm Webers. They are popular with Mopar guys, they're even more undersized for a 426 Hemi!


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