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The W Returns – Building a Chevy 409-CID “W” engine » MCP-0901-409-10

Edelbrock offers new Performer RPM aluminum cylinder heads that feature the stock port locations and valve angles. They include a 220cc volume intake port runner and 90cc exhaust ports with hardened spring cups, screw in studs and hardened guide plate. If there was a consistent sore point with 409 engines, it was the lack of guide plates, which allowed valve train instability.

Edelbrock offers new Performer RPM aluminum cylinder heads that feature the stock port locations and valve angles. They include a 220cc volume intake port runner and 90cc exhaust ports with hardened spring cups, screw in studs and hardened guide plate. If there was a consistent sore point with 409 engines, it was the lack of guide plates, which allowed valve train instability.


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