Engine Casting
Numbers & ID'ing a AMC block
When You are looking at ANY American Motors Vehicle
while the casting number is important, more important is the engine size cast on the side
of the block. All 67-up AMC V8 blocks were cast, bored and stroked out of the same block.
There is no such thing as a AMC BIG BLOCK all were SMALL BLOCKS. From 290, 304, 343, 360,
390, and 401. So when you might be not sure, it is highly advisable to crawl under the
vehicle and see what is stamped on the block, this will be on either side under the motor
mount if a V8. There are a number of 'replacement blocks' AMC used from 1970-up with no
casting numbers. It is not uncommon for someone selling a AMC to believe that their engine
is a '390 or 401' when in fact it is a 360 or 343. They all appear the same! So simply
make sure and crawl under the vehicle. In Mexico AMC produced a "big Mexican
Six" a bored of 282-6. Could not get them in USA, Mexican market only. Most AMCers
never heard of one but Jeep people love them. Ironically you can go to O'Reillys Auto
Parts & in computers, it shows parts for 282-6. Here is a VAM (Vehiculos Automotores
Mexicano) AMC 282-6
Here are two photos to show you where to look, this is driver side & passenger side of a AMC block.
AMC factory replacement blocks ( & numbers ground off)
Engine Casting
Numbers
Ci.
Year Comments
(courtesy Todd Jesme)
--------------------------------------------------------------------
3144932
327 75-61
3147230
327 57-62
3153044
327 57-62
3153055
327 57-62
3153077
250 56-61
3153677
327 57-61
3166463
327 63-67
3169824
287 63-66
3179062
290 66-69
3179063
343 67-69
3190079
401 1971
3190806
390
68-69 7/16" Head Bolt
3190808
232,390 64-71
3195292
304 70-71
3195527
304 70-82
3195528
360 70-84
3195528
390,401 70-80
3195529
390
69-70 1/2" Head Bolt
3195529
401 72-76
3198951
401 71-78
3414725
401 72-74
3220411
401 75-78
4160275
327 63-66
440275
327 58-62
446527
320 1955
4486279
390 68-70
4487211
304 70-76
4488874
401 71-76
AMC engines built for Georgia & Tennessee had a non
repeating number below the build code
stamped on them. This was done in Kenosha.
More Head
Casting Numbers:
(courtesy Dave Crooks)