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  • 421 super duty

    bigblueowx 1 year ago

  • @bigblueowx

    This is a 421HO (376hp) with three 2 barrel carbs (tripower). 421SDs had two 4bbl carbs (the mildest version was 405hp). It was only produced in 1962-63 (maybe 20 in 1961, most of which were sold to Mickey Thompson for racing). Before 1962, they had a 389SD.

    The SD421 was a full race engine, 11.5-13.0 compression depending on version, solid lifters, MUCH BIGGER cam, aluminum intake/exh-man, etc .Good for 11/12 sec 1/4 mile in heavy tanks.

    watch?v=MgTdWDQGxfo

    watch?v=nnJ188I4XnQ

    1967PmdGto 11 months ago

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