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

cookietruck said

Those EQ heads aren’t the same castings as the old ones.

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True, but it’s not relevant if you aren’t using them OOTB.

The current EQ heads are the 318 version of the old one. The 360 version didn’t return but that’s just what I have read. PIE can make the 318’s better than the 360’s.