hi
i have just completed a conversion on my 93 F-250 from a 5.8 to a 429 from a 1982 school bus. rebuilt engine and and complete front end. i do have a question about this engine. it has a vibration that fades in and out at all rpms. used the orginal harmonic ballancer but have a new fly wheel, which was ordered for a 1988 460. i didnt see any added weights on the orginal flywheel. does any one have any ideas as to what the vibration could be