Just check that website link above. Then read the details of the description from O'Reily's. It states, VIN 6 . . . . Romeo plant . . . 6 bolt flywheel. This pretty much proves that at least some of the VIN 6, 4.6L's came from Romeo plant with 6 bolt flywheels, 11 bolt valve covers, and all the other specs of Romeo 4.6L