Ok , need to step back

67Dart273 said

Hell He USED to have an early hemi in the thing!!

Richard, I'm not sure a 400hp SB is gonna be much of a mileage / cruiser improvement over a mild 400 stroker!!!

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Depends on the cam and state of tune. Intake, cylinder head and exhaust also play a big role in the area of efficiency. A small cam can make 400hp and still get good mileage.