Which head/combustion chamber is better for performance? Speed master aluminum LA or aftermarket magnum iron head?

273 said

Other than replacement magnum heads isn't the only aftermarket magnum performance head done by Edelbrock ?

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Edelbrock Aluminum Magnum and:
Mopar did an Iron ‘R/T’ head
Maybe the Engine quest head (from ?Auatralia??) was also better than the Chinese magnum repo head as far as I remember from the forums-something about a water jacket plug on the side of the good heads..??