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I have two old flathead six engines that I know are plymouth but I can't figure out what kind of car they go to. The number on the driver side top corner of the 55 engine is P26-84......
and the numbers on the 54 is p25*16...... I'm not sure what all these numbers mean and if anyone can help me identify what model they went to, it would be a big help.
 

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1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
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I haven't put my hands on the service information that I'm looking for, but the P25 is a 1954. There was an early and late 1954 with a change in displacement.
P26 is 1955 and was the larger displacement.
 
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