Identifying engine help - Impala Tech
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post #1 of 12 (permalink) Old 04-03-2018, 04:44 AM Thread Starter
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Identifying engine help

I’m hoping someone can assist me with determining what engine I have in my 61 Impala. It is definitely not the original engine.
Photos attached but the casting block number is 397 010 but from my research it appears to be missing a 0 number and could be either a 327 or 350

Thanks for your help
Attached Images
File Type: jpg C165076D-0BB9-401F-833B-1E7F9AF05843_1522744676747.jpg (17.1 KB, 30 views)
File Type: jpg CBB8436F-B74F-411D-8193-9FB61B5C2EF6_1522745028171.jpg (21.2 KB, 28 views)
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post #2 of 12 (permalink) Old 04-03-2018, 09:09 AM
 
 
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you would need to give us the numbers that are on the block id pad located on the passenger side right in front of the cyl head. that will give you casting plant, date cast, cu inch, and transmission it was built with. thats if that block hasnt been through the decking process during a rebulid sometime over the years..
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post #3 of 12 (permalink) Old 04-03-2018, 09:23 AM
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Although the Date won't give us the "Year" built, it can usually be figured out by the other info on the Code. The Year is on there though, but is located on the Back of the Block and can be hard to see with the engine still in the car.

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post #4 of 12 (permalink) Old 04-03-2018, 02:45 PM Thread Starter
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Thanks the other photo shows the front stamping, sorry not that clear. The numbers are- 15J237262, there is also another stamp with larger font but it is very hard to read- 160MJ

The other details next to the block casting numbers is GM 20

Thanks for your help
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post #5 of 12 (permalink) Old 04-03-2018, 04:01 PM
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Nope NO MJ listed: and MU would be a rare 1967 Camaro SS 350. Get some brake cleaner and spray the pad and then hit it with a green, or blue "Scotch-Brite" pad. You can look here to get decode info:

How to decode Chevy Engine Codes

Big Dave
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post #6 of 12 (permalink) Old 04-04-2018, 04:19 AM Thread Starter
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Thanks managed to scratch back the paint to find the missing numbers V0616CMJ
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post #7 of 12 (permalink) Old 04-04-2018, 09:08 AM
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CMJ came back as 3 possibilities:

CMJ 1974 350 160 HP 4-Barrel t400 A-Body, police
CMJ 1975 350 145 HP 4-Barrel THM 350/400, A, B-Body, federal
CMJ 1980 305 - automatic trans

In this case, you need to find the Date Code that is on the back of the Block. Not real sure on the newer engines, but the older ones have what looks like a Slotted Screw Head, then a Letter for the Month, then some Numbers for the Day and Year, then another Slotted Screw Head.

Although, if you research the Casting Number on the Block, that could possibly narrow it down some more, if getting to the Date Code is not possible.

Bill

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post #8 of 12 (permalink) Old 04-04-2018, 04:04 PM Thread Starter
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Thanks, I came up with a similar conclusion, however looking at the dates for the casting the last year for my casting was 1979, so assuming this is accurate it would make it a 350.
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post #9 of 12 (permalink) Old 04-05-2018, 11:24 AM
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Quote:
Originally Posted by NZPhil View Post
Thanks, I came up with a similar conclusion, however looking at the dates for the casting the last year for my casting was 1979, so assuming this is accurate it would make it a 350.
A casting made from September on in 1979 probably would have ended up in a 1980 vehicle.
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post #10 of 12 (permalink) Old 04-05-2018, 07:04 PM
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And, based on 62bill's info, it's a 305.

Two doors, four doors, wagons, and ragtops.
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post #11 of 12 (permalink) Old 04-06-2018, 04:48 PM Thread Starter
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Agree it could be a 305 other than a can’t find a 305 block casting number anything close to 397010, only a 350 however that number has an extra “0” 3970010?
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post #12 of 12 (permalink) Old 04-06-2018, 05:05 PM
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A 305 will be a bigger V8 than a 283 which was common back then, and offers more torque to accelerate your car thanks to's long stroke. There were more 305's made than any other small block engine as it filled a lot of niche's for GM. It will respond to to the usual hop up tricks, but it's small bore will restrict deep breathing.

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