HOL­LEY SIN­GLE PLANE

Hot Rod - - Are Carbs Still King? -

The Hol­ley was the first of the sin­gle-plane in­takes to be tested. Like those that would fol­low, the Hol­ley ver­sion demon­strated the in­her­ent na­ture of the de­sign by of­fer­ing siz­able gains in peak power pro­duc­tion. In fact, the sin­gle-plane Hol­ley of­fered im­prove­ments in peak power and torque com­pared to the dual-plane in­takes, with peaks of 636 hp at 6,900 rpm and 557 lb-ft of torque at 5,000 rpm. Note that the peak power came higher in the rev range, but the peak torque ac­tu­ally oc­curred ear­lier than the dual plane. De­spite of­fer­ing more peak power and torque, torque pro­duc­tion suf­fered down low with the sin­gle plane, as the 415 pro­duced 499 lb-ft of torque at 4,000 rpm.

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