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The W Returns – Building a Chevy 409-CID “W” engine » MCP-0901-409-4

Beginning in 1962, an “X’ was cast into the front of the 409 blocks, as well as 348 truck replacement engine to denote the performance orientation. These are the good ones to start with. Note the screw in freeze plugs.

Beginning in 1962, an “X’ was cast into the front of the 409 blocks, as well as 348 truck replacement engine to denote the performance orientation. These are the good ones to start with. Note the screw in freeze plugs.

The 409 used for the build-up was a seasoned block selected and prepped by Lamar Automotive. As you can see, he has a wide assortment of “W” engines to pick from.
The block was cleaned up and honed prior to installation by Lamar Automotive. The block was carefully checked for cracks, all channels flushed and all threaded holes were cleaned for future bolt insertion. The block was rough honed with 220 and finished with 280-grit to seat the piston rings.

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