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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: Mike81K10 on January 31, 2024, 03:55:47 PM

Title: Engine Identification
Post by: Mike81K10 on January 31, 2024, 03:55:47 PM

I would like to verify the year of an engine block I have. My engine block info is:

4 BOLT MAIN BLOCK; Casting Number 3970010 (29 GM), My Engine ID Number is: C4A1C7254 V0831TMR
What does (TMR) Stand for - Transmission Manual?


What I have seen is: Year: 1969-79   Casting:3970010   350   HP 185   HHP 370   Main: 2 or 4   (car, truck, Vette)

I understand it was produced in Flint, August 31
The casting indicates a 350, yet I saw someplace that C4A stands for a 305 - is that wrong. Where can find the manufacture year?

Can we get a engine identification chart on the forum or do we have one? I did not see one, yet I could have missed it.

Title: Re: Engine Identification
Post by: VileZambonie on January 31, 2024, 05:06:59 PM

TMR   1980   350   van, bus, a/t, Cal   M LT9   170   4   C-30 & 3500

https://www.nastyz28.com/gm-chevy-codes/chevy-engine-codes-suffix-8.php

Title: Re: Engine Identification
Post by: Mike81K10 on January 31, 2024, 05:32:05 PM

Thanks VZ, missed that on the nasty WEB site. I was suppose Cal in application means California and not sure what M LT9 stands for in engine VIN, but guessing Light Truck.

Title: Re: Engine Identification
Post by: Captkaos on February 01, 2024, 05:05:52 PM

M LT9 is the 350 4bbl.. 
http://www.73-87chevytrucks.com/techinfo/7387CKMans//Service/ST_330_80_1980_Chevrolet_Light_Truck_Service_Manual.pdf#page=405 (http://www.73-87chevytrucks.com/techinfo/7387CKMans//Service/ST_330_80_1980_Chevrolet_Light_Truck_Service_Manual.pdf#page=405)

Title: Re: Engine Identification
Post by: Mike81K10 on February 01, 2024, 08:56:09 PM

Thanks Captkaos!