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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.

Lamar Walden Automotive builds custom forged aluminum pistons for these engines, cutting valve relieve holes when necessary and setting the compressions ratios as requested by customers (in our case 11:1). This is a CNC process that ensures consistency throughout the engine.
The Eagle Crank was balanced and test fitted to the block before final insertion. Clevite bearings are used for the mains, journals and cam bearings.

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