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Old 09-08-2003, 09:43 AM
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pls help with my engine...

first.... sorry for my bad english....

i have a engine with the number 3970010.

3970010 is a 302 or 327 or 350 engine.
i have found the following numbers.

K12 05 CMJ
16B49 5806

is this a 302 or 350 engine ?

thx

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Old 09-08-2003, 10:50 AM
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is it the original motor in the car? if so what year is it?
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Old 09-08-2003, 11:03 AM
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Waldi,

Here's a link:
http://www.mortec.com/castnum.htm

according to this page, if you're sure it's from the mid-70's then it's a 350. GM used this casting nubmer pretty regularly and on a variety of block types.

I've got a 350, 4-bolt with that number. Good block, high nickel and little changes for smog.

-B.
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Old 09-08-2003, 03:51 PM
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camaro, thats not the original engine.

i dont understand this....

k12 05 CMJ

CMJ =
1974 CMJ 350 t4OO police - 4 full size
1980 CMJ 305 automatic trans. H - - full size/Camaro


but
16B495806

1=chevy
6= year
b= plant
.....

why a 6 ? 6 is for year 76 ?
but the CMJ code says 74 or 80

this is the engine...

http://stadt.heim.at/entenhausen/120001/olds/1.htm

Last edited by waldi; 09-08-2003 at 03:51 PM.
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Old 09-08-2003, 04:16 PM
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Waldi,

My reference book shows the CMJ is listed to a 350 from 1974 to 1976. It also lists the 1980 305. I would say you have the 350 which would correspond to the 16B**** number you listed for 1976.
Keep trying your English and we'll keep trying to help.
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Old 07-25-2006, 10:50 AM
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CMJ 350 engine benefits?

I did a search on this police engine in this forum and found alot of trouble shooting posts. I would like to know what is the positive characteristics of this engine compared to the other 350's. I just picked one up and was told that it is rebuilt. Came completely dressed out and only cost 600.00. I need to know if they are special in any way, or just because they were used in police cars has made them popular.

Thanx,
Dennis

Nibornej@cox.net
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Old 07-25-2006, 10:57 AM
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These blocks are good because of the high nickle and or tin content in them, makes them stronger. Waldi, if your block is a 4 bolt main its a 302 or 350. Since your numbers(16B and CJM) correspond to a 350 from the mid 70's thats my vote. Very good block for a build IMO.
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Old 07-25-2006, 11:14 AM
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CMJ 350 vs. 305

I would guess the only way to tell the difference between these two engines is to go into mortec and pull the casting numbers. The 305 shows a different casting number, but can still have the cmj stamped on front pad.
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Old 07-25-2006, 11:17 AM
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Quote:
Originally Posted by BK455
I would guess the only way to tell the difference between these two engines is to go into mortec and pull the casting numbers. The 305 shows a different casting number, but can still have the cmj stamped on front pad.
305 would be a 2 bolt main block, the 350 would be a 4 bolt. Also you could measure the bore which should be 4" for a 350 and 3.736" for the 305.
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