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7 An off-the-shelf Edelbrock hydraulic roller camshaft is used for the Edelbrock/Musi 555ci bullet. It is listed as PN 2264, which carries an intake valve lift of 0.632 inch, while the exhaust is listed as 0.648 inch. Duration at 0.050 inch is 248 degrees and 256 degrees, intake and exhaust respectively. Lobe separation comes in at 112 degrees.