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I have a bowtie 454 in my WCC roadster. It has a mild cam and stock compression. Heads are aluminum squareport units breathing through a 750cfm holley. All was well until I replaced the stock aluminum manifold with a new edelbrock RPM performer. The motor runs great and likes the manifold except that now I get a distint motor vibration at exactly 2000 and 4000 rpm.
No knocks and everything is tight on both ends of the crank. Anyone had this happen?
From Shakin in Sherwood
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