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The 318s are internally balanced engines featuring neutral-balanced harmonic balancers and flex plates, but 360s are externally balanced. We used a B&M SFI-certified flex plate in our Barracuda with great success. Our unit was for a 727, while our Diplomat uses a 904 trans. the 727 flexplate (PN 10236) is quite a bit larger than the unit for the 904 trans (PN 10239) and cannot be used on a 904-equipped vehicle ,as the flex plate will not clear the smaller ring gear.