anyone here have a website i can look up engine casting #'s to find out
what the motor i just got with my cj rolling chassis is? thought it to
be 258 and that is what i was told but i am having my doubts now that it
is home. any help greatly appreciated thanks

http://web.archive.org/web/200306230...mcengcodes.htm
God Bless America, ßill O|||||||O
mailto:LWHughes3rd (AT) aol (DOT) com http://www.billhughes.com/


marvin martian wrote:

thanks bill that one doesnt help much thereis no numbers on the
passenger side i found numbers on drivers side but i cant find a website
where i can punch in #'s to find out what motor this is. would you
happen to know of a website that icould do this?

The 258 or 232 ID numbers are stamped on a flat area on the block just
below #2 spark plug.

If you have no flat area there, you do not have either engine.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

marvin martian wrote:

marvin martian wrote:
It took me a while, but I think I've found what you are looking for:

<URL:http://www.amxfiles.com/archive/show.cfm?postid=90288&row=2>

The above URL has a listing covering AMC _head_ casting numbers from
1966 to 1979 (you didn't say what year you thought you had). This list
won't help you sort out a block with a 232 crank from a block with a 258
crank, but it could help you narrow down the year or ID an engine
cobbled up from multi-year parts.


<URL:http://www.butlers-a1.com/amcm.htm>

The above URL is probably what you are looking: It gives block casting
numbers, head casting numbers and crank casting numbers for a variety of
AMC engines from 1970 to 1993, ranging from the 151ci/2.5L to the 401ci.


<URL:http://www.planethoustonamx.com/parts%20&%20Literature/engine_casting_numbers.htm>

This last won't help you because it only covers AMC V8s from 1957 to
1984, but I'm including it here against the chance that someone will
find it useful.

As Bill and Mike said, the best way to ID the engine is to look for the
machined pad on the passenger (right) side of the block and decode the
"Engine Day Build Code". On the other hand, depending on what sort of
life the engine lead there might be nothing left there to read -- AMC
didn't strike those stamps very deep on some engines.


<URL:http://members.aol.com/brimiljeep/WebPages/ArchiveJeepSerialNumberPage.html#JeepCJSerialNumbe rLocation>

If you can find a VIN stamped on the right front part of the frame (as
described in the above URL) you should be able to decode what engine the
frame originally came with. Good luck with that, though, as I've never
been able to find one on an older CJ.


Let us know what you find.

Hey, didn't someone post a while back that some of the aftermarket
blocks have no numbers on them on that machined pad. Maybe it was about
Jasper engines?

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's


Lee Ayrton wrote:

I found a couple of mentions while I was searching for the below that
some factory warranty replacement blocks had no numbers, but I think
that those were more in relation to cars instead of Jeeps. I guess it
might make sense if AMC only used to day build codes to account for
engines going to the vehicle assembly plant -- the code isn't a serial
number, after all, and had no relation to VINs except displacement.


Mike Romain wrote:

couldnt get exact year but did find out it was a 258 thanks for the help
guys

Yer welcome. What year were you hoping for? There were model-year
changes to emission controls and manifolds, and changes in the valve
cover helps mark a few years as well, so if you give us a ball-park on
the year someone here might be able to match it to the engine they have.

Oh, and the engine plant ran on a calendar year schedule, while the
vehicle plant ran on a model-year schedule. This means that the engine
put in by the factory might not have the same year ID as the frame.



marvin martian wrote:

wasnt hoping for a specific year but i did some more checking and found
it t be an 82. someone ground off id numbers on passenger side but i
found a set on drivers side that local engine shop deciphered for me.
thanks again