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The W Returns – Building a Chevy 409-CID “W” engine » MCP-0901-409-7

Note the improvement in quality over the last 45 years; these aluminum pistons are far superior to the original cast units offered by GM and are of the 425-HP GM design. The rings are 5/16-inch thickness (Sealed Power Plasma Poly), and the compression is GM stock using a 6.135-inch long connecting rod.

Note the improvement in quality over the last 45 years; these aluminum pistons are far superior to the original cast units offered by GM and are of the 425-HP GM design. The rings are 5/16-inch thickness (Sealed Power Plasma Poly), and the compression is GM stock using a 6.135-inch long connecting rod.


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