Magnum EFi idea? Suggestions please

318willrun said

Also, didn't the latter year runners on the barrel intake have revised runners that made a little more horsepower in the upper RPM range?

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Only revision I am aware of is the deletion of EGR. As I recall, performance wise there was no difference between the early and late intake.

You might be thinking of the mod's people do to cut back the runners. But that was never a factory mod.