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

toolmanmike said

Out of the box Speedmasters are close to equal to X's or J's. Did I read that somewhere or am I completely wrong?

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Out of the box Speedmaster heads are in the 250cfm area. I’m betting a J or X head can be made to flow better than that but be prepared to pay a handsome price. I could do a set for free (or close to free) and I’m not even interested.