Help to I.D. this Motor

[shelby192]

Hello to all, brand new to this forum so bare with me. I've just purchased an old Chris Craft that has a Chrysler motor in it. The original 6 Cyl Herc was removed and this installed I believe in the early 60's. Information and numbers I have, Chrysler Sea-v Marine, Model 80AR, Serial No. 72511. There is also another number on the tag. It is 2104. All this info appears on tag located on flywheel cover assembly. It has dual Carter carbs and two bolts that hold value covers on. Currently oil has water in it, this will need to be investigated and repaired but would really like some help to identify what I'm starting with. Any help, information or input will be greatly appreciated. Thanks in advance.

 

[RicardoMarine]

Photos could be worth several hundred or more words here!

 

[shelby192]

Working on that now, only have photos on my phone and don't have ability to upload right now.

 

[bondo]

Ayuh,.... If ya got water in the oil, the block is probably cracked,....

Just start fresh, 'n stuff in a SBChevy,.....

 

[daves69]

http://www.allpar.com/history/marine.html

It's likely a 318 "poly" V-8 between '57-'66 years. You should be able to find a
number on it maybe this can help............

Chart A
Plymouth Poly V8
Engine ID	CID	Year
P27	241	1955
P29	270*	1956
P29	277	1956
FP29	303 Fury	1956
P31-1	277	1957
P31-2	301	1957
FP31	318 Fury	1957
FLP	318 Fury	1958
MP8	318	1959
P318	318	1960
R318	318	1961
S318	318	1962
T318	318	1963
V318	318	1964
A318	318	1965
B318	318	1966