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Old 11-16-2010, 01:40 PM
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Help identify Chev 400CI engine #

I can't identify the year of my Chev 400 CI engine using the guidance on the internet. It has a serial # on the passenger side block boss just in front of the head. It is 15R452183. I rebuilt it so I know it has 2 bolt main caps & it came out of a Monte Carlo, but I need to know what year it is.
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Old 11-16-2010, 03:35 PM
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Those numbers aren't coming up. Get the numbers off the rear of the engine near where the bell housing bolts up.
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Old 11-16-2010, 03:44 PM
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Need the block date casting code off the rear bellhousing flange of the block, it will be a 3 or 4 place alpha numeric code(like 12B6, which is "B"= February, "6"=1976).

Block casting code would help also, same area of block, 6 or 7 digits.

# you have posted is just a VIN derivative matched to the car it came from, can't determine year from it, as far as I know. The "452183" matches the last 6 digits of the original vehicles VIN. There should be an application code stamped above the # you gave, on that same front pad, alphanumeric and 8 digits starting with VO, TO, or FO then 3 numbers, then 3 letters. The three letters at the end can be decoded to give the original application.

Being that it is 2-bolt main, it is 1973-1980, the 1970-72 are all 4-bolt main.
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Old 11-17-2010, 05:25 AM
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Quote:
Originally Posted by newdeuce303
I can't identify the year of my Chev 400 CI engine using the guidance on the internet. It has a serial # on the passenger side block boss just in front of the head. It is 15R452183. I rebuilt it so I know it has 2 bolt main caps & it came out of a Monte Carlo, but I need to know what year it is.
Thanks
THIS thread has info on ID'ing whether the engine is a 400 to begin with.

The date code on blocks and heads is usually a single letter followed by a series of numbers. It breaks down like this:

A- January
B- February
C- March
D- April
E- May
F- June
Etc.

The first set of numbers is the day of the month. This can be 1 or 2 numbers.

The second set of numbers (the sets can be separated by a space, but sometimes they are right next to each other) shows the year and can be (most often) 1, and up to 4 digits long.

Example:
  • B20- Feb. 2 of '70, '80, '90
  • B208 = Feb. 20 of '68, '78, '88, '98- this is the format most often seen on blocks and heads.
  • B2078 = Feb. 20 of 1978
  • B201978 = Feb. 20 of 1978

If you look at the casting number and casting date, you can figure out what the actual year and app for the casting. The SUFFIX can also help, just be aware the suffix can be lost when the block is decked and can be forged.
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Old 11-17-2010, 06:06 AM
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Quote:
Originally Posted by newdeuce303
I can't identify the year of my Chev 400 CI engine using the guidance on the internet. It has a serial # on the passenger side block boss just in front of the head. It is 15R452183. I rebuilt it so I know it has 2 bolt main caps & it came out of a Monte Carlo, but I need to know what year it is.
Thanks
Your 15R452183 deciphers as:
1= Chevrolet
5=1975
R=Arlington final assembly
452183= Last six digits of vehicle engine was installed in

The 1975 is the model year vehicle the engine was originally installed, depending on the date (month/day) of the vehicle assembly the engine could be a 74 or 75.
The specifics listed in the above post's will narrow it down between the two.
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Old 11-17-2010, 01:31 PM
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Thanks to 1ownerT for the info , I wondered if the "5" in the #'s he posted could siignify 1975, and you provided the answer.

I learned something new today
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