421: Powered by two Continental GTSIO-520-Ds of 375 hp (280 kW) each 421A: Powered by two Continental GTSIO-520-Ds of 375 hp (280 kW) each 421B Golden Eagle/Executive Commuter: Powered by two Continental GTSIO-520-Hs of 375 hp (280 kW) each 421C Golden Eagle/Executive Commuter: Powered by two Continental GTSIO-520-Ls or GTSIO-520-Ns of 375 hp (280 kW) each |