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Old 03-01-2016, 12:45 AM   #3
Greenlight
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Join Date: Dec 2004
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Default Re: Chevy engine blocks origin ?

As far as I know, the blocks were cast at one of four places.

The casting foundry ID may be located near (next to) the casting number on the block.

CFD - Central Foundry, Defiance, OH

GM-D - Central Foundry, Defiance, OH
(there was some sort of merger between two casting foundries that resulted in different foundry IDs. A foundry in Danville, IL was part of GM Central Foundry at one point too.)

SMCO - Saginaw Metal Casting Operations

???? - Massena Casting Plant, Massena, NY (not sure if any Chevy blocks were ever cast there)



CFD and GM-D are the most popular that I have seen.

There is a large single digit number near the casting number that is used to identify the drag core pattern number.



Tonawanda Engine Plant is where some blocks were machined and assembled.

others:
Romulus Engine Plant (since 1976)

Silao Engine Plant in Mexico (opened in 2001)
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