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high performance edelbrock cylinder heads cast at the ultramodern edelbrock ... aluminum foundry edelbrock heads are made from a356 aluminum and heat ... of accuracy features for all edelbrock heads include threaded inserts in rocker ... gasket seal and all edelbrock heads are designed to accept high-lift cams ... performer rpm heads for big block chevy edelbrock offers ... heads for the 396-502 family of chevrolet ... port configurations the 60459 oval port head utilizes 290cc intake ports and a semi- ... ratios the 60559 rectangular port head features an 118cc open chamber and high ... long/300cc short intake ports both heads work with all generations of chevy ... the edelbrock ls1 pro-porttm cylinder head is the perfect casting for any custom ... cylinder head porter cylinder head porters and engine builders alike now ...