I am curious to know if early 4020 cylinder heads could be swapped with later 4020 cylinder heads? IF it is possible what is the best way of telling if it has been swapped? The reason I ask this is my uncle has a 4020 serial # T 76493 which according to Outland's 2002 serial # book is a 1964 4020. We have a '67 4020 that I overhauled and it has pencil style injectors.So should a '64 4020 and a '67 4020 both have the same style injectors?
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