DMorgan Posted May 8, 2010 Share Posted May 8, 2010 Hey, I just got the build sheet on my 1963 B-421 "S" & it says that the engine is an EN-402. The serial tag is gone off the engine so there is no way of telling if it has been changed out or not. Anyway my question is whats the difference between the mack EN-401 & the EN-402? I always thought that all B-42's had En-401 engines in them. Thanks for the help, Daniel Quote Link to comment Share on other sites More sharing options...
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