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I have a slant six that i am trying to find out what i have. The stamped numbers are 6-225R 1 7 the casting numbers are
030-11 and 3175 the head casting number is 027600-3 it appears to be new and painted drab green. any help would be great i am thinking installing it in my 63 Dart.
instead of rebuilding the engine thats in it. any high performance tips?
Thanks
Ted
 

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Sounds like a 225 CID industrial or possible military application engine. I believe this might be the following:

6 = 1976
225 = 225 CID
R = regular fuel
030-11 = build date maybe 3/11/76?
3175 is the sequential number
No engine plant mark usually means it was made a Trenton

This is my best guess.
 

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Looking at this list:

http://www.mopar1.us/casting.html

The only close match I find is the head casting for a 225 CID from 1975-80, which is 4027600-5. I don't find any other numbers that match or begin with zero. But the 1 and 7 are probably year and month, or month and year.
 

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If you look at the 1962-64 numbers on this site: http://www.tpocr.com/chryec.html

You might extrapolate that you have a 1961 engine, since the 1962 calls out "S17" - yet, that's for the 170 CID engine. So this gets more mysterious.
 

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Or, look at the first page here, bottom right:

S225R 1 7 030-11 3175 could be:

Special engine
225 CID
R = regular fuel
1 = Jan
7 = 7th day
030-11 could be .030" overbore
3175 the serial number, or the year embedded in it.
 

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Last digit in the build date sometimes indicated the shift the engine was built on so 030-11 could mean March 1st, 1st shift.
 

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3175 casting code indicates 1970 if on the 10,000 day calendar system.
 

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Bear in mind, the head may not be original to the block. If it was a military application it also may have gone through a refurbishment cycle or two, and you simply might have ended up with one that never got installed after its last refurbishment.
 
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