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Greenlight · 03-01-2016, 12:45 AM

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)

03-01-2016, 12:45 AM	#3
Greenlight Member Join Date: Dec 2004 Posts: 215 Likes: 16 Liked 79 Times in 22 Posts	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)