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What engine do I have in my 48 Plymouth?

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My engine number is P15A866680.  I have searched my computer until I am blue in the face, (no pun intended) but cannot find a number listing for flat sixes. I thought I had a 218, but maybe it's a 230??? Is it a 1948 engine? Thanks in advance!  I am hoping it is the original engine.

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See if this attempt to add a link from a post of mine a day or two ago.  Has a list of mopar flat motor #'s and year,size.

 

 

 

DJ

phlA6yf7.html

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Thanks guys! I went to the site and saw that indeed I do have a 1948 Plymouth engine, as the block number is a P15; I am tickled. But the listing threw me for a loop in that it listed the block number for a 1948 Plymouth as being a "15C". My block number simply says "P15" then a "star" (I thought it was an "A" until I looked real close). So no "C" after the "15". And the list did not identify if the engine was a 218 or a 230...it was blank. So one question was answered - I have a 48 motor. But I still don't know the cc size...

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I found out I have a 218! I went to Wikipedia and searched for 1948 Plymouths and found that all 48 Plymouths had a 218 (217.9, to be exact ) installed. 

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   You won't know for sure until you pull the plug at #6 and measure stroke.  4.500" or 4.625"

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