4bt 72 Dart

toolmanmike said

Isn't there a newer model 4BT that has a balance shaft which helps a lot with the shaky idle?

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The 4bt is sold with a balance shaft in an agriculture application. It adds even more height to the engine. I have seen one one time when I worked at Cummins. It’s there so it can run at a high rpm, of what I don’t know though.