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Big Block or Small Block Frame Mount?

April 26, 2017big block frame Mount small

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Big Block or Small Block Frame Mount?

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I finally put a SB & BB frame mount side by side to view the difference. Hmmmm…. more meat on the BB unit, and different hole location. For whatever it’s worth, here are some dimensions on 350 & 455 frame mounts that may help you determine if you have the correct frame mounts. The only similarity between the 350 & 455 frame mounts is the dimension between the lower single hole and the upper two holes. It is 4 1/2″ for both. The difference is in the location of the horizontal hole for the cross bolt.