Chevrolet’s heads for W engines fall into four groups—heads specifically used on 348s, heads specifically used on 409s, heads used on both engines, and the rare Z11-only heads. Within the 409 versions, there were two models—moderate performance and, later, high …

Designed for 1961-65 Chevrolet "W" series 348/409 big blocks engines. These heads have improved port design for more performance, original port locations and valve angles for bolt-on convenience; CNC port match 220cc intake and 115cc exhaust ports for optimum flow and power, hardened spring cups, screw-in rocker studs an hardened guide plates.

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2012年6月19日 · Bob Walla of Bob Walla Racing (BWR) developed aluminum heads for 348/409 engines because of pent up market demand. He came out of the box with two styles of 409 heads. One is based on the 690 version, which is one of the best production heads Chevrolet made, while the other is a raised-port version of the same head.

Edelbrock Performer RPM 348/409 Chevy cylinder heads have been specifically designed for the 1961-65 Chevy W Series 348/409 big block engines. These Performer RPM heads feature aluminum construction with original port locations and valve angles for bolt-on convenience.

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2002年2月21日 · For 348 heads on a 348 block, the only thing you'd need to be aware of is lack of spark-plug cooling passages on early 348 heads and blocks. If mixing early heads on a later block, or later heads on an early block, you will need to plug the open coolan passage.