it is a 401 but the book says that the 61 lesabre didnt come with a 401 but it came with a 250 horse 364 and a 235 horse 364 the codes are prefix:h=215 v8; 3h=v8 364; 4h=v8 401 the invicta and electra came with the 401 but from what i understand most parts are interchangable from the 401 to the 364 but not all.
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