258 year ID - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 10-15-2000, 02:05 PM
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258 year ID

I looked up the site on ORC that gives the decoding of the six digit ID code, but the year chart only goes up to 1980, even though the page says 73-86! I'm trying to figure out what year this motor is, I know its not a 1980 because that would be a 4. The code is:
012C17. I know from the numbers that it was built on 12/17/??, and its a 258/2bbl, 8:1 CR. But what year does the -0- signify, I'm thinking 81?

Brad
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post #2 of (permalink) Old 10-15-2000, 06:16 PM
 
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Re: 258 year ID

Brad
I am not sure if I can help but if you look at the driver side of the block there should be a block casting number ,also on the head around the middle between the rocker arms there should be a number also if you can tell me these I will look it up on some stuff I downloaded when I was looking for a rebuilt engine.
I just went to the site on line but they have changed it and no longer give these numbers

Ray
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post #3 of (permalink) Old 10-15-2000, 09:03 PM
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Re: 258 year ID

well im not sure what chart you are looking at.. but mine says an 80=0 not 4..
from there it goes up to 6 for 86..
if its an 80 the valve cover should be about straight on both sides.. i believe in 81 they changed it over to where the carb side has those curves in it for those stupid hold down nuts..

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post #4 of (permalink) Old 10-15-2000, 09:40 PM
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Re: 258 year ID

Brad-

My 1981 Jeep factory manual says the 1980=0, 1981=1. The C is for the engine size.

Good Luck!
Kriss

post #5 of (permalink) Old 10-15-2000, 10:47 PM
 
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Re: 258 year ID

My 1980 Jeep T.S.M says engine build data code 3=79 4=80 I believe 1980 had a steel valve cover ...mine does but the build data says it was made in 79 3-12-C-11 translates into 1979-December-258 CID-11=day or DEC 11 1979...but if he gives me the block and head casting numbers I may be able to give him a close range from that

Ray
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post #6 of (permalink) Old 10-16-2000, 01:35 AM
 
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Re: 258 year ID

Brad-
Drop by the Kerr shop on the South side of Broadway in Farmington.
It is the parts house across the street and a little West of NAPA.
The guys there are hooked up to a pay type parts distributoin site that should I.D. your block.
Just take both the casting #'s from the driver's side of the block (foreward bott0m) and the stamped #'s on the block's passenger side (foreward near head deck) and they should be able to I.D. the thing.
Too bad I learned this a little late to save me a lot of pain ...

JAF
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post #7 of (permalink) Old 10-16-2000, 01:51 AM
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Re: 258 year ID

have you tried this Decoder site?:

http://www.allpar.com/mopar/enginecodes.html

Good Jeepin'

Larry
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post #8 of (permalink) Old 10-16-2000, 03:26 PM
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Re: 258 year ID

Now I am confused again. Three of us have factory T.S. Manuals. Unhuman's 1979 one says that 4=1980, my 1981 says 0=1980 and jeebgod's unknow year says 0=1980. I'm sure that all of us can read, so what gives?

Thanks!
Kriss

post #9 of (permalink) Old 10-16-2000, 05:56 PM
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Re: 258 year ID

no kidding.. mine is from a jeep buyers guide.. i have found mistakes in the book already.. so i would say for sure that mine is 100%.. and i dont have any more 258's lying around to check it.. but i do think the top of the heads are different.. and so are the diameter of the head bolts.. 80's and under used a thicker bolt than the 81 and up's.. i believe those are the correct years..

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post #10 of (permalink) Old 10-16-2000, 11:23 PM
 
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Re: 258 year ID

Are we all talking about the same numbers I am refeering to the engine build data code on the passenger side between #2 & 3 cylinder not the vin number.
The engine and head casting numbers will sometimes give a ballpark year,Jaffer has a link to the site where I got these numbers from but they no longer list the casting numbers.so if he posts the casting nimbers I will look them up on the pages I downloaded.


Ray
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