Edelbrock Performer RPM Aluminum Cylinder Heads 348/409 Chevy
Features:Designed for 1961-1965 Chevrolet "W" series 348/409 big-block engines
Original port locations and valve angles for bolt-on convenience
CNC port matched 220cc intake and 90cc exhaust ports for optimum flow and power
Improved port design for more performance
Hardened spring cups, screw-in rocker studs and hardened guideplates
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