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Be advised that holley and Demon jets are not the same. First off, the ramps that lead into the orafice is not flat on the Demons. Second, the actual holes are not the same size. The sizes do intersect at about the 70's. In other words a 90 holley will not be the same size as a 90 size demon. I just changed my demon jetting using holley jets. And if I remember right, the 70 demon was the same as the 68 holley.
TJ
Be advised that holley and Demon jets are not the same. First off, the ramps that lead into the orafice is not flat on the Demons. Second, the actual holes are not the same size. The sizes do intersect at about the 70's. In other words a 90 holley will not be the same size as a 90 size demon. I just changed my demon jetting using holley jets. And if I remember right, the 70 demon was the same as the 68 holley.
TJ
TJ76 has a good point....be sure to match the orifice size when comparing, as well as the jet number.